DRAFT UGANDA STANDARD  
  DUS 2434  
Second Edition  
2022 -11-dd 
 
 
 Reference number  
WDUS 2434: 2022 
© UNBS 2022   
  
Building hardware - Mechanically operated locks and locking 
plates - Requirements and test methods  
 WDUS 2434 : 2022  
ii © UNBS 2022  – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provi sions of a contract. Users are 
responsible for its correct application  
© UNBS 2022   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  WDUS 2434: 2022  
© UNBS yyyy  – All rights reserved  iii 
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ ........  3 
4.1 General  ................................ ................................ ................................ ................................ ..........................  3 
4.1.1  Essential characteristics  ................................ ................................ ................................ ..........................  3 
4.1.2 Return force of latch bolt  ................................ ................................ ................................ ..........................  4 
4.1.4  Product information requirements  ................................ ................................ ................................ ..........  4 
4.1.5  Strength of lever lock key  ................................ ................................ ................................ .........................  5 
4.1.6  Strength of bolt acti ons ................................ ................................ ................................ ........................  5 
4.1.7  Minimum follower restoring torque  ................................ ................................ ................................ .........  5 
4.1.8  Protection against removal from door  ................................ ................................ ................................ .... 5 
4.2 Category of use (first digit)  ................................ ................................ ................................ .........................  6 
4.2.1  Resistance to side force on latch bolt ................................ ................................ ................................ ..... 6 
4.2.2  Torque to operate the lock  ................................ ................................ ................................ .......................  6 
4.2.3  Strength of follower stops  ................................ ................................ ................................ ........................  7 
4.2.4  Torque resistance for lockable deadbolt operation by handle/knob  ................................ ...................  7 
4.3 Durability requirements (second digit)  ................................ ................................ ................................ ...... 9 
4.3.1  Durability of latch action  ................................ ................................ ................................ ..........................  9 
4.3.2  Durability of deadbolt mechanism  ................................ ................................ ................................ ...........  9 
4.3.3  Durability of locking snib mechanism ................................ ................................ ................................ ..... 9 
4.4 Door mass and door clos ing force (third digit)  ................................ ................................ .........................  9 
4.4.1  Door mass  ................................ ................................ ................................ ................................ ..................  9 
4.4.2  Door closing force  ................................ ................................ ................................ ................................ ..... 9 
4.5 Suitability for use on fire resistance and/or smoke control door set (fourth digit)  ...............................  9 
4.6 Safety (fifth digit)  ................................ ................................ ................................ ................................ ........  10 
4.7 Corrosion resistance and temperature (sixth digit)  ................................ ................................ ................  10 
4.7.1  Corrosion resistance ................................ ................................ ................................ ...............................  10 
4.7.2  Operation at extreme temperatures ................................ ................................ ................................ ....... 10 
4.8 Security (seventh digit)  ................................ ................................ ................................ ..............................  10 
4.8.1  General  ................................ ................................ ................................ ................................ .....................  10 
4.8.2  Locking  ................................ ................................ ................................ ................................ .....................  10 
4.8.3  Manual deadlocking  ................................ ................................ ................................ ................................  10 
4.8.4  Torque resistance of knob of tubular lock ................................ ................................ ............................  11 
4.8.5  Requirements for side force  ................................ ................................ ................................ ...................  11 
4.8.6  Deadbolt projection  ................................ ................................ ................................ ................................ . 12 
4.8.7  Resistance to force in the unlocking di rection (disengaging force)  ................................ ..................  13 
4.8.8  Requirements for pulling of anti -separation bolt  ................................ ................................ .................  14 
4.8.10  Requirement for torque resistanc e of lockable followers  ................................ ................................ . 15 
4.8.11 Strong key attack on lever locks  ................................ ................................ ................................ .........  16 
4.8.12  Resistance to force on box protected locking plates  ................................ ................................ ........  16 
4.8.13  Resistance to side force on locking plates  ................................ ................................ ........................  17 
4.8.14  Resistance to pulling on locking plates  ................................ ................................ ..............................  17 
4.8.15  Resistance to lifting force on locking plates  ................................ ................................ ......................  17 
5 Test,  assessment  and sampling  methods  ................................ ................................ ........................  19 
5.1 General  ................................ ................................ ................................ ................................ .................  19 
5.2 Test apparatus  ................................ ................................ ................................ ................................ ..... 20 
5.2.1  Test door  ................................ ................................ ................................ ................................ ..............  20 
5.2.2  Drill machine  ................................ ................................ ................................ ................................ ........  20 
5.2.3  Test fixtures  ................................ ................................ ................................ ................................ .........  20 WDUS 2434 : 2022  
iv © UNBS 2022  – All rights reserved  
 5.3 Test procedure  - Drilling  procedure  ................................ ................................ ................................ .. 21 
5.4 Test methods  - general  ................................ ................................ ................................ .......................  21 
5.4.1  Dangerous  substances  verification  ................................ ................................ ................................ .. 21 
5.4.2  Return  force  of latch bolt ................................ ................................ ................................ ...................  21 
5.4.3  Product  information  requirements  verification  ................................ ................................ ...............  21 
5.4.4  Strength  of lever  lock key ................................ ................................ ................................ ..................  21 
5.4.5  Strength  of bolt action  ................................ ................................ ................................ ........................  21 
5.4.6  Minimum  follower  restoring  torque  ................................ ................................ ................................ .. 22 
5.4.7  Protect ion against  removal  from  door  ................................ ................................ ..............................  22 
5.5 Test methods  - Category  of use ................................ ................................ ................................ ........  22 
5.5.1  Resistance  to side force  on latch  bolt ................................ ................................ ..............................  22 
5.5.2  Torque  to operate  the lock ................................ ................................ ................................ .................  24 
5.5.3  Strength  of follower  stops  ................................ ................................ ................................ .................  24 
5.5.4 Torque  resistance  for lockable  deadbolt  operation  by handle/knob  ................................ .............  24 
5.6 Test methods  - durability  ................................ ................................ ................................ ...................  25 
5.6.1  Durability  of latch action  without  force  applied  ................................ ................................ ...............  25 
5.6.2  Durability  of latch  action  with force  applied  ................................ ................................ ....................  26 
5.6.3  Durability  of deadbolt  mechanis m ................................ ................................ ................................ .... 28 
5.6.4  Durability  of locking  snib mechanism  ................................ ................................ ..............................  29 
5.7 Door  mass  and closing  force ................................ ................................ ................................ .............  29 
5.7.1  Door  mass  verification  ................................ ................................ ................................ .......................  29 
5.7.2  Door  closing  force  ................................ ................................ ................................ ..............................  29 
5.8 Suitability  for use on fire resistance  and/or smoke  control  doorset  ................................ .............  30 
5.9 Safety  ................................ ................................ ................................ ................................ ...................  30 
5.10  Corrosion  resistance  and temperature  ................................ ................................ .............................  30 
5.10.1  Corrosion  resistance  ................................ ................................ ................................ ..........................  30 
5.10.2  Operation  at extremes  of temperature  ................................ ................................ ..............................  30 
5.11  Security  ................................ ................................ ................................ ................................ ................  31 
5.11.1  Key operation  and locking  ................................ ................................ ................................ .................  31 
5.11.2  Torque  resistance  of knob  of tubular  lock test ................................ ................................ ................  32 
5.11.3  Resistance  to side force  ................................ ................................ ................................ .....................  33 
5.11.4  Deadbolt projection measure  ................................ ................................ ................................ ............  35 
5.11.5  Resistance  to forcing  in the unlocking  direction  (disengaging  force)  test................................ ... 35 
5.11.6  Resistance  to pulling  of anti-separation bolt test  ................................ ................................ ...........  38 
5.11.7  Resistance  to forcing  of locating  device  in sliding  door  locks  ................................ ......................  39 
5.11.8  Torque  resistance  for lockable  deadbolt  operation  by handle/knob  test ................................ ..... 39 
5.11.9  Strong  key attack  on locks  with internal  blocking  elements  ................................ ..........................  39 
5.11.10  Resistance  to end force  on box  protected  locking  plate  test................................ .........................  39 
5.11.11  Resistance  to side force  on locking  plate  test ................................ ................................ .................  40 
5.11.12  Resistance  to pulling  on locking  plate  ................................ ................................ .............................  41 
5.11.13  Resistance  to lifting  force  on locking  plate  ................................ ................................ .....................  41 
5.12  Key related  security  for lever  locks  ................................ ................................ ................................ .. 42 
5.12.1  Detaining  elements  verification  ................................ ................................ ................................ .........  42 
5.12.2  Effective  differs  verification  ................................ ................................ ................................ ...............  42 
5.12.3  Differing  step heights  on key ................................ ................................ ................................ .............  42 
5.12.4  Non-interpassing  of keys  with just one interval  differ  ................................ ................................ .... 42 
5.12.5  Coding  protection  ................................ ................................ ................................ ...............................  42 
6 Assessment and verification of constancy of performance – AVCP  ................................ ............  42 
6.1 General  ................................ ................................ ................................ ................................ .................  42 
6.2 Type  testing  ................................ ................................ ................................ ................................ .........  43 
6.2.1  General  ................................ ................................ ................................ ................................ .................  43 
7 Classification  ................................ ................................ ................................ ................................ ....... 49 
7.1 Coding  system  ................................ ................................ ................................ ................................ .... 49 
7.2 Classification  for mechanically  operated  locks  and locking  plates  ................................ ..............  50 
7.2.1  Category  of use (first  digit)  ................................ ................................ ................................ ................  50 
7.2.2  Durability  (second  digit)  ................................ ................................ ................................ .....................  50 
7.2.3  Door  mass  and closing  force  (third  digit) ................................ ................................ .........................  50 
7.2.4  Suitability  for use on fire resisting  and/or  smoke  control  doorset (fourth  digit)  .........................  51 
7.2.5  Safety  (fifth  digit)  ................................ ................................ ................................ ................................  51 WDUS 2434: 2022  
© UNBS yyyy  – All rights reserved  v 
 7.2.6  Corrosion  resistance  and tempe rature  (sixth  digit)  ................................ ................................ .........  51 
7.2.7  Security  and drill resistance  (seventh  digit)  ................................ ................................ .....................  52 
7.2.8  Key identification  of lever  locks  (eight  digit) ................................ ................................ ....................  52 
7.3 Example  for classification  of locks,  latches  and their  locking  plates  ................................ ............  52 
8 Marking,  labelling  and packaging  ................................ ................................ ................................ ...... 53 
8.1 On the product  ................................ ................................ ................................ ................................ ..... 53 
8.2 On the packaging  ................................ ................................ ................................ ................................  53 
8.3 On the installation  instruction ................................ ................................ ................................ ............  53 
A.2 Grade B  ................................ ................................ ................................ ................................ .................  55 
A.3 Grade  N ................................ ................................ ................................ ................................ .................  55 
 
. WDUS 2434 : 2022  
vi © UNBS 2022  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (U NBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Stand ardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Tec hnical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer groups, private sector and other interested parties.  
Draft Uganda Standar ds adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Sta ndards Council.  
The committee responsible for this document is Technical Committee UNBS /TC 107, Mechanical engineering . 
This second  edition cancels and replaces the first edition ( US 192:2022 ), which has been technically revised.  WDUS 2434: 2022  
© UNBS yyyy  – All rights reserved  vii 
 Introduction  
Mechanicall y operated locks and their locking plates used in fire resistant and/or smoke control door 
assemblies require additional attributes in order to conform to the Essential Requirement “Safety in case of 
fire” as a part of a complete assembly. Additional requi rements for locks and their locking plates used on fire 
resistant and/or smoke control door assemblies are specified in Annex A.  
This Uganda  Standard for mechanically operated locks and their locking plates specifies requirements and 
test methods for durab ility, strength, security, and functionality and they are  
a) for use on doors, in  buildings;  
b) for use on fire and smoke compartmentation doors fitted with door closing devices, to enable such 
doors to close reliably and thus achieve self -closing in the event o f fire;  and 
c) for use on locked fire doors to maintain the fire integrity of the door  assembly.  
This standard specifies locks and locking systems intended for use in different environmental and security 
conditions, thus necessitating different grades.  
This Uganda  Standard specifies the dimensions and properties required for security and for the assessment of 
fire resistance and/or smoke control door suitability.  
This Uganda  Standard does not specify any particular design or installation . 
 UGANDA STANDARD  WDUS 2434: 2022  
 
© UNBS 2022  – All rights reserved  1 
 Building  hardware  - Mechanically  operated  locks  and 
locking  plates  - Requirements  and  test methods  
1 Scope   
This Uganda Standard specifies requirements and test methods for durability, strength, security and 
functionality of mechanically operated locks and their locking plat es: 
a) for use in doors in buildings;  
b) for use on fire and smoke compartmentation doors fitted with door closing devices, to enable such doors to 
close reliably and thus achieve self -closing in the event of fire; and  
c) for use on locked fire doors to ma intain the fire integrity of the door assembly.  
This Uganda Standard covers locks and their locking plates, which are either manufactured and placed on the 
market in their entirety by one producer or produced by more than one producer, or assembled from su b-
assemblies produced by more than one producer and designed to be used in combination.  
This Uganda Standard specifies mechanically operated locks and locking systems intended for use in different 
environmental and security conditions, thus necessitating d ifferent grades.  
This Uganda Standard does not specify Multipoint locks or their locking plates  
This Uganda Standard specifies the dimensions and properties required for security.  
Assessment of the contribution of the product to the fire resistance of spe cific fire resistance and/or smoke 
control door set assemblies is beyond the scope of this Uganda Standard . 
2 Normative references   
The following referenced documents referred to in the text in such a way that some or all of their content 
constitutes requi rements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies.  
US ISO 7539 Corrosion of metals and alloys - Stress  corrosion  testing - Part 1: General guidance on testing 
procedure   
3 Terms and definitions   
For the purposes of this document, the following terms and definitions apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp   
2 © UNBS  yyyy – All rights reserved  
 3.1  
bored latch set  
fastener that comprises an integral assembly of door furniture with a tubular latch  
3.2 
bored lock set  
fastener that comprises an integral assembly of door furniture wi th a tubular lock  
3.3 
cylinder  
device, usually separate from but engaging with its associated lock or latch, that contains the parts operated  
by the key  
3.4 
cylinder lock  
lock in which the lock mechanism is operated by one or more cylinders  
3.5 
deadbolt  
movable part of a lock that usually engages a locking plate and withdraws into a lock case that is operated at 
least  in one direction by a key, handle or thumb turn  
3.6 
deadlocking  
action of moving a bolt to a thrown position where pushing back of the bolt i s positively prevented  
3.7 
detaining element  
component which is moved by a key into a pre -determined position to allow the bolt to be operated  
3.8 
differ  
variation between lock mechanisms of similar design, achieved by the detaining elements, which enables  
each lock  to be operated only by its own key  
3.9 
effective differ  
difference between lock or key recognition systems of similar design achieved only by the detaining elements  
which allows each lock or key recognition system to be operated only by its own key 
Note 1 to entry: The number of effective differs is equal to the number of theoretical differs after deduction of  the differs 
suppressed by the manufacturer due to technical constraints.  
3.10 
follower  
part of a lock that operates latch  bolt and/or dead bolt(s) when turned by a spindle  
3.11  
forend  
part of a case through which the lock is fixed to the door leaf and through which the latch bolt and/or deadbolt  
pass  
3.12 
key 
device that is removable and portable and is used to operate the lock  
3.13 
latch  
self-engaging fastener which restrains a movable component (e.g. door leaf) in a closed position and which 
can be  released  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  3 
 3.14 
latch action  
arrangement and performance of the constituent parts that operate a latch bolt  
3.15 
latch bolt  
spring -loaded movable p art of a lock that usually engages a component fixed to a frame, and withdraws into a  
lockcase that automatically engages a locking plate to keep the door leaf in its closed position  
3.16 
leverlock  
lock with integral differs operated by a key  
3.17 
lock 
fastener which secures a movable component in a closed position within a door frame and which is operated 
by a  key or other device  
3.18 
locking plate  
component, fixed to a frame to engage a bolt, or bolts  
3.19 
locking snib  
manual device, usually in the form o f a small lever or knob, operable after installation and which can be 
operated  to prevent the deadbolt or latch bolt from being thrown or withdrawn, or to change the function of a 
lock 
3.20 
lock mechanism  
constituent parts of a lock that operate the deadbo lt and/or latchbolt, where required, provide the  
differs  
3.21 
manual deadlocking  
dead locking where movement of the deadbolt is by key or handle/thumb turn  
3.22 
multi -point lock  
lock comprising at least two points of interaction (security, anti -separation  or clenching) interlinked and 
centrally  controlled, where at least two points are more than 200 mm apart in locked or thrown position  
3.23 
shared latch action  
latch action in which withdrawal of the latch bolt is by means of a handle or key  
4 Requirements  
4.1 General  
4.1.1  Essential characteristics  
The following requirements have special significance because they are a part of the Annex ZA Essential 
characteristics.  
a) Self -closing ability   
4 © UNBS  yyyy – All rights reserved  
 1) ability to close and keep the door in a closed position  
i) 4.1.2 , return force of latch bolt;  
ii) 4.2.1, side force on latch bolt;  
iii) 4.4.2, door -closing force;  
2)  suitability for use on fire resistance and/or smoke control door set  
i)  4.5, suitability for use on fire resistance and/or smoke control door set.  
b) Self-closing ability - durability  
1) 4.3.1, durability of latch action  
2) 4.7.1, corrosion resistance  
All locks regardless of classification shall conform to 4.1.2, 4.1.4, 4.1.6, 4.1.8 and where applicable 4.1.3,  
4.1.5, 4.1.7.  
4.1.2 Return force of latch bol t 
The return forces F1 see Figure 1 of the latch bolt shall not be less than 2,5 N. The return force shall be tested in 
accordance with 5.4.2  
 
Figure 1 — Return force of latch bolt  
4.1.4  Product information requirements  
Products classified in accordance w ith this Uganda Standard shall have clear and detailed instructions for 
their installation and maintenance. These instructions shall contain:  
a) The limitation of the products intended use, the limitation of the door mass and door dimensions, 
temperature r ange and the field of door application and distance range between locking plate 
and  forend. If the product is tested for security classification supported or unsupported.  
b) Information to ensure that the product can conform to the performance requirement s of this 
document, including known restriction in use, for example conditions under which the product 
could be rendered inoperable. In particular it shall be clearly stated which locking plates are 
 suitable in combination with the lock and vice versa.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  5 
 c) Declaration of the maximum side force (25 N, 50 N or 120 N) against which key or handle 
operation can be performed, at the various grades indicated in Table 2.  
d) An extended temperature range if applicable.  
e) Declaration about suitability for use on fir e resistance and/or smoke control door set if applicable. 
F 
f) Declaration of intention to be used with spring supported furniture (or not).   
The product information shall be verified in accordance with 5.4.3. See also Annex C for further information on 
product information.  
4.1.5  Strength of lever lock key  
The key for lever lock shall have the strength so it can resist a torque of 2,5 Nm and still be able to operate its 
lock with the torque M1 appropriate with its grade in 4.2.2.  
This requirement is not ap plicable to cylinder keys  
4.1.6  Strength of bolt actions  
The dead bolt components shall resist a torque of 30 Nm and the latch bolt components shall resist a torque 
of 20 Nm operated through the follower and after both tests the lock shall still be able t o operate with the 
torque M1 and M2 appropriate with its grade in 4.2.2. The strength of bolt actions shall be tested in 
accordance with 5.4.5.  
4.1.7  Minimum follower restoring torque  
The lock shall have a minimum restoring torque on the follower of 0,8 Nm , unless the manufacturer has 
declared on the Product Information Sheet (see 4.1.4) that the product is intended for use with spring 
supported furniture. The restoring torque shall be tested in accordance with 5.4.6.  
4.1.8  Protection against removal from d oor 
The product shall be designed in such way that those parts which contribute to its burglar resistance cannot 
be removed:  
a) from the outside of the door when door is closed and locked by any tool;  
b) from the inside of the door when door is closed and locked, using any of the tools that fits to the screw 
heads illustrated in Figure 2, if security is necessary from the inside.  
The design shall be verified in accordance with 5.4.7  
 
Figure 2 — Screw heads not allowed in security from inside   
6 © UNBS  yyyy – All rights reserved  
 4.2 Category of use (first digit)  
4.2.1  Resistance to side force on latch bolt  
The latch bolt shall resist a side force F2 (see Figure 3) as specified in Table 1 after which operating torque 
shall not exceed that specified in 4.2.2, return force on latch shall still be  less than 2,5 N, and closing force 
shall not exceed that specified in 4.4.2. The resistance to side force shall be tested in accordance with 5.5.1  
 
Figure 3 — Resistance to side force on latch bolt  
4.2.2  Torque to operate the lock  
4.2.2.1  The lock shall conform to torque on key 4.2.2.2 and torque on follower 4.2.2.3.  
4.2.2.2  The torque on the key to operate the lock without side force shall not exceed M1 in accordance 
with Table 1 (see Figure 4).  
The torque on the key shall be tested in accordance to 5.5 .2.2.  
 
Figure 4 — Torque to operate deadbolt or latch bolt with key  
4.2.2.3  The torque on the follower to operate the lock without side force shall not exceed M2 in 
accordance with Table 1 (see Figure 5).  
The torque on the follower shall be tested in ac cordance to 5.5.2.3.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  7 
 
 
Figure 5 — Torque to operate deadbolt or latch bolt via the follower  
4.2.3  Strength of follower stops  
The latch components and travel limit stops shall resist a torque M3 (see Figure 6) as specified in Table 1, 
and the lock shall sti ll be able to operate with the torque appropriate with its grade in 4.2.2.  
The strength of follower stops shall be tested in accordance with 5.5.3.  
 
Figure 6 — Strength of follower stops  
4.2.4  Torque resistance for lockable deadbolt operation by handle/k nob 
4.2.4.1  Torque resistance of lockable followers  
A lock with a lockable follower shall resist a torque of M4 (see Figure 7) as specified in Table 1, and the lock 
and its lockable follower shall still be able to operate with the torque M1 and M2 appropri ate with its grade in 
4.2.2.  
The resistance of lockable followers shall be tested in accordance with 5.5.4   
8 © UNBS  yyyy – All rights reserved  
 
 
Figure 7 — Torque resistance of lockable followers  
4.2.4.2  Torque resistance of rim lock with integral lockable handle/knob  
A rim lock with an int egral lockable handle or knob shall resist a torque of M4 (see Figure 7), where M4 (Nm) 
= 0,4 (kN) x maximum radius in mm of the handle/knob after which the lock and its lockable handle/knob shall 
still be able to operate with the torque appropriate with i ts grade in 4.2.2. The torque resistance shall be tested 
in accordance with 5.5.4  
Table 1 — Category of use  
Clause  Requirement  Test 
method  Test para -
meter  Grade 1  Grade 2  Grade 3  Unit 
4.2.1 Resistance 
to side force 
on latch  5.5.1 F 2 2 3 3 kN 
4.2.2.2  Maximum 
torque to 
operate the 
lock without 
side force by 
key 5.5.2.2  M 1 1,2 1,0 0,8 Nm 
4.2.2.3  Maximum 
torque to 
operate the 
lock, without 
side force 
through 
follower  5.5.2.3  M 2 10 7 5 Nm 
4.2.3 Strength of 
follower 
stops 5.5.3 M 3 20 40 60 Nm 
4.2.4.1  Torque   
resistance   
of   lockable 
follower  5.5.4 M 4 30 50 70 Nm 
4.2.4.2  Torque  
resistance  
of  Rim lock 
with integral 
lockable 
handle /knob  5.5.4 M 4 0,4 (kN) x 
maximum 
radius(mm)  0,4 (kN) x 
maximum 
radius 
(mm)  0,4 (kN) x 
maximum 
radius 
(mm)  Nm WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  9 
 4.3 Dura bility requirements (second digit)  
4.3.1  Durability of latch action  
The latch action, the shared latch action (where applicable) or automatic deadbolt shall complete the minimum 
number of latch test cycles at the appropriate force in accordance with the gr ade selected in Table 2.  
After the test, the operation of the latch action with key or follower shall not exceed the torque M1 and M2 for 
the selected grade in 4.2.2 nor shall the door closing force F9 exceed that specified in 4.4.2. The test method 
for du rability of latch action is described in 5.6.1 or 5.6.2.  
4.3.2  Durability of deadbolt mechanism  
The deadbolt mechanism shall complete the minimum number of deadbolt test cycles in accordance with the 
grade selected from Table 2.  
After the test, the operati on of the deadbolt mechanism with key or follower shall not exceed the torque M1 
and M2 for the selected grade in 4.2.2. The door closing force F9 as graded in 4.4.2 shall remain after the 
selected number of test cycles. The test method for durability of d eadbolt mechanism is described in 5.6.3.  
4.3.3  Durability of locking snib mechanism  
The locking snib mechanism shall complete the minimum number of cycles specified in Table 2 without 
affecting the change of the different functions influenced by the snib p osition.  
The test method for durability of locking snib mechanism is described in 5.6.4.  
Table 2 - Durability requirements  
Grade  Latch action  Shared latch action  Deadbolt 
manually 
locking  Deadbolt 
manually 
locking  Deadbolt 
Automatically  
locking  Key Hand le 
A 50 000  12 500  37 500  12 500  50 000  12 500  
B, L, R, W  100 000  25 000  75 000  25 000  100 000  25 000  
C, M, S, X  200 000  50 000  150 000  50 000  200 000  50 000  
4.4 Door mass and door closing force (third digit)  
4.4.1  Door mass  
The dimensions and mass of the test door are specified in 5.7.1 and 7.2.3.  
4.4.2  Door closing force  
The door closing force F9 applied to the test door in accordance with the grade specified in 7.2.3 shall be 
sufficient to enable the latch bolt to correctly engage the locking plat e every time.  
4.5 Suitability for use on fire resistance and/or smoke control door set  (fourth digit)  
Products for the different classifications shall conform to the grades given in 7.2.4 and the requirements for 
grade A, B or N of Annex A..   
10 © UNBS  yyyy – All rights reserved  
 4.6 Safety (fi fth digit)  
Not applicable.  
4.7 Corrosion resistance and temperature (sixth digit)  
4.7.1  Corrosion resistance  
The lock shall resist the time specified in 7.2.6 in a corrosion chamber. The torques on the key or follower to 
operate the deadbolt and/or latch b olt shall not exceed M1 or M2 as specified in Table 1. The door closing 
force as graded in 4.4.2 shall remain after the time in the corrosion chamber. The return force of latch bolt in 
4.1.3 shall not be less than 2,5 N. The corrosion test shall be in acco rdance with 5.10.1.  
NOTE  For the purpose of this standard, the ability to operate after the test is the only criterion; appearance 
is irrelevant.  
4.7.2  Operation at extreme temperatures  
The torque to operate the deadbolt and/or latch bolt at extreme tempe ratures as specified in 7.2.6 shall not 
exceed M1 or M2 specified in Table 1. The return force of latch bolt in 4.1.3 shall not be less than 2,5 N.  
Operation torque at extreme temperatures shall be tested in accordance with 5.10.2.  
4.8 Security (seventh di git) 
4.8.1  General  
Requirements for classification of security are given in Table 3.  
The requirements given in 4.8.2, 4.8.4, 4.8.5, 4.8.6, and 4.8.7 apply to all dead locking bolts.  
4.8.2  Locking  
Locks in security grade 1 to 7 shall be capable of deadlocki ng in one of the following ways. The type of 
deadlocking shall be declared in the product information in accordance with 4.1.4.  
4.8.3  Manual deadlocking  
4.8.3.1  General  
It shall not be possible to remove the key from the lock unless the deadbolt is in its  unlocked or fully thrown 
and deadlocked position.  The manual deadlocking shall be verified in accordance with 5.11.1.1.  
4.8.3.2  Manual locking with intermediate locking positions  
The deadbolt shall be deadlocked in all positions in which the key can be rem oved. The manual locking with 
intermediate locking position shall be verified in accordance with  5.11.1.2.  
4.8.3.3  Automatic deadlocking bolt  
The deadbolt shall be able to reach its fully thrown and deadlocked position with a gap of 5 mm between the 
locks forend and the locking plate. The automatic deadlocking bolt shall be verified in accordance with 
5.11.1.3.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  11 
 4.8.3.4  Automatically locking latch bolt  
The deadlocking latch shall be able to reach its fully thrown and deadlocked position with a gap of 5 mm 
between the locks forend and the locking plate. The automatic deadlocking latch bolt shall be verified in 
accordance with 5.11.1.4.  
4.8.4  Torque resistance of knob of tubular lock  
4.8.4.1  Torque resistance of knob or lever handle on bored lock and latch sets  
The locked knob or lever handle shall not force open with a maximum torque of M7, see Figure 22 and Table 
3. 
It is not necessary for the knob or lever handle to be operable with a torque of M1 or M2 after the resistance 
test with a torque M7.The torque re sistance of M7 shall be tested in accordance with 5.11.2.1.  
NOTE  This requirement is only applicable to grade 1 and 2 as this type of product is not considered suitable 
for higher security applications.  
4.8.4.2  Resistance of knob on bored lock and latch s et to the pull off test  
The locked knob shall resist a direct pull force of F8, see Figure 27 and Table 4.  
The knob and bored lock shall be able to lock and unlock and be operated with the torque M1 and M2 after 
the pull off test. The pulling off shall be tested in accordance with 5.11.2.2.  
4.8.5  Requirements for side force  
4.8.5.1  General  
Side force shall be applied to lock mechanisms in accordance with Figures 28, 29 or 30 as appropriate, 
depending upon the intended use of the lock and depending upon any limitations identified in 4.1.4.  
4.8.5.2  Resistance to side force on deadbolt  
This requirement applies to locks without drill protection that are security classified at grades 1 to 4 and 6.  
The deadbolt shall resist a side force of F4 when the force is hel d for 60 s (see Figure 8 and Table 3). It is not 
necessary for the lock to be operable with an operation torque M1 or M2 after the side force test. The side 
force on deadbolt shall be tested in accordance with 5.11.3.1.  
 
Figure 8 — Resistance to side forc e on deadbolt  
4.8.5.3  Resistance to drilling and side force on deadbolt  
This requirement applies to locks with drill protected deadlocking bolts that are classified at grades 5 and 7.   
12 © UNBS  yyyy – All rights reserved  
 The deadbolt shall have drill resistance and resist a side force of F4 w hen the force is held for 60 s (see 
Figure 8 and Table 3).  
It is not necessary for the lock to be operable with an operation torque M1 or M2 after the drill and side force 
test. The side force and drill resistance on deadbolt shall be tested in accordance with 5.11.3.2.  
4.8.6  Deadbolt projection  
4.8.6.1  Deadbolt projection without hooks  
The unloaded deadbolt that is in its fully thrown and detained position shall have a minimum length of L1 as 
specified in Table 3 (see Figure 9).  
4.8.6.2  Deadbolt with hooks  
The unloaded deadbolt with hooks for anti -separation performance that is in its fully thrown and detained 
position shall have a minimum length of L1 and H1 as specified in Table 3 (see Figure 10).  
If the manufacturer's product specification declares that the lock is only intended for sliding doors the distance 
L1 can be reduced but it needs to be at least 12 mm.  
The projection shall be measured in accordance with 5.11.4.  
 
Figure 9 — Linear moving or rotating deadbolt without hooks  
4.8.6.2  Deadbolt with ho oks 
The unloaded deadbolt with hooks for anti -separation performance that is in its fully thrown and  detained 
position shall have a minimum length of L1 and H1 as specified in Table 3 (see Figure 10).  
If the manufacturer's product specification declares t hat the lock is only intended for sliding doors the distance 
L1 can be reduced but it needs to be at least 12 mm. The projection shall be measured in accordance with 
5.11.4.  
The deadbolt intended for anti -separation shall also be classified for 4.8.8 pulli ng of anti -separation bolt.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  13 
 
 
Figure 10 — Linear moving or rotating deadbolt with hooks  
4.8.7  Resistance to force in the unlocking direction (disengaging force)  
4.8.7.1  Resistance to disengaging force  
This requirement applies to locks without drill protect ion that are security classified at grades 1 to 4  
and 6.  
The product shall resist a disengaging force of F5 when the force is held for 60 s on the deadbolt (see Figure 
11). 
At no time during or after the application of the disengaging force is shall the b olt projection be less than L2 for 
linear operating bolts. For rotating bolts the deformation d under the force shall not be more than 3 mm when 
the force is applied to the bolt, see Figure 33 and Table 3.  
It is not necessary for the lock to be operable wi th an operation torque M1 or M2 after the disengaging  
force test.  
Where the linear operated deadbolt is protected by a box locking plate with the same or higher security  
grade as the lock, the disengaging force requirement for grades 3, 4 and 6 shall be a minimum of 2 kN.  
Resistance to disengaging force shall be tested in accordance with 5.11.5.1.  
 
Figure 11 — Resistance to disengaging force  
4.8.7.2  Resistance to drilling and disengaging force  
This requirement applies to locks with a drill protected dead locking bolts function that are classified at grades 
5 and 7.   
14 © UNBS  yyyy – All rights reserved  
 The product shall have drill protection and resist a disengaging force F5 when the force is held for 60 s, see 
Figure 11 and Table 3.  
At no time during or after the application of the disengagin g force shall the bolt projection be less than L2 for 
linear operating bolts, see Figure 31 or 32 and Table 3.  
For rotating bolts the deformation d under the force shall not be more than 3 mm when the force is applied to 
the bolt, see Figure 33 and Table 3 . 
When the force is applied it shall not be possible to operate the locked bolt to an unlocked position using any 
tool other than the correct key with a maximum torque of 5 Nm.  
It is not necessary for the lock to be operable with an operation torque M1 or M2 after the disengaging force 
test. 
Where the linear operated deadbolt is protected by a box locking plate with the same or higher security grade 
as the lock, the disengaging force requirement for grades 5 and 7 shall be a minimum of 2 kN.  
Resistance to t he disengaging force and drill protection shall be tested in accordance with 5.11.5.2.  
4.8.8  Requirements for pulling of anti -separation bolt  
4.8.8.1  Resistance to pulling of anti -separation bolt  
This requirement applies to locks without drill protected de adlocking bolts and an anti -separation function that 
is classified at grades 1 to 4 and 6.  
The anti -separation bolt shall resist a direct pull force of F6 when the force is held for 60 s, see Figure 12 and 
Table 3.  
It is not necessary for the lock to be op erable with an operation torque M1 or M2 after the pulling force test. 
The resistance of pulling force shall be tested in accordance with 5.11.6.1.  
 
Figure 12 — Resistance to pulling of anti -separation bolt  
4.8.8.2  Resistance to drilling and pulling of an ti-separation bolt  
This requirement applies to locks with drill protected deadlocking bolts and an anti -separation function that is 
classified at grades 5 and 7.  
The product shall have drill protection so it can resist a pulling force F6 when the force is held for 60 s, see 
Figure 12 and Table 3.  
It is not necessary for the lock to be operable with an operation torque M1 or M2 after the pulling force test.  
The pulling force and drill resistance shall be tested in accordance with 5.11.6.2.  
4.8.9  Requirements  for anti -lifting devices in sliding door locks  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  15 
 4.8.9.1  Resistance to force of anti -lifting devices in sliding door locks  
This requirement applies to locks without drill protected integrated locating devices with the function to protect 
the door from being  moved in a vertical direction that are security classified at grades 1 to 4 and 6.  
The locating device shall resist a force of F7 when the force is held for 60 s, see Figure 13 and Table 3.  
The resistance of the location device for sliding doors shall be  tested in accordance with 5.11.7.1.  
4.8.9.2  Resistance to force of anti -lifting devices in sliding door locks with drill protection  
This requirement applies to locks with drill protected integrated locating devices with the function to protect the 
door fr om being moved in a vertical direction that are security classified at grades 5 and 7.  
The locating device shall be drill protected so it can resist a force of F7 when the force is held for 60 s, see 
Figure 13 and Table 3.  
The resistance of the location de vice for sliding doors shall be tested in accordance with 5.11.7.2.  
 
Figure 13 — Resistance to force of anti -lifting devices in sliding door locks  
4.8.10  Requirement for torque resistance of lockable followers  
4.8.10.1  Torque resistance of lockable follow ers 
A lock with a lockable follower shall resist a torque of M5, as specified in Figure 14 and Table 3, without 
forcing the lock open.  
The lock does not need to be operable with a torque M1 or M2 after application of the torque M5. The torque 
resistance of  lockable followers shall be tested in accordance with 5.11.8   
16 © UNBS  yyyy – All rights reserved  
 
 
Figure 14 — Torque resistance of lockable followers  
4.8.10.2  Torque resistance of rim locks with an integral lockable handle/knob  
Rim locks with an integral lockable handle or knob shall resis t a torque of M5, see Figure 14, where M5  
(Nm) = 1,0 (kN) x maximum radius in mm of the handle/knob.  
The lock does not need to be operable with a torque M1 or M2 after application of the torque M5. The torque 
resistance shall be tested in accordance with 5 .11.8  
4.8.11 Strong key attack on lever locks  
The lever lock shall resist a torque M6 (see Figure 15) as specified in Table 3, through the key hole without 
being forced open.  
It is not necessary for the lock to be operable with an operation torque M1 or M2  after the strong key attack.  
If sufficient torque to force the lock cannot be applied via the original key hole, then the lock shall be 
considered to have passed. Strong key attack shall be tested in accordance with 5.11.9  
 
Figure 15 — Strong key attack on lever locks  
4.8.12  Resistance to force on box protected locking plates  
A locking plate equipped with a box to protect the associated deadbolt shall resist a force F5 for 60 s on the 
box in X -, Y-, and Z - direction. The box shall not be deflected more th an 3 mm in X - and Y - directions, see 
Figure 16 and Table 3.  
The box shall remain located to the locking plate after the test.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  17 
 Resistance to force on box protected locking plates shall be tested in accordance with 5.11.10.  
NOTE  This requirement can be waiv ed if the associated lock deadbolt resists the appropriate end force for the class 
or the box does not have a security purpose (e.g. adjustment or decorative boxes).  
 
Figure 16 — Resistance to force on box protected locking plates  
4.8.13  Resistance to sid e force on locking plates  
The locking plate shall withstand a side force of F4 when held for 60 s at those apertures that are intended to 
operate with the dead bolt, see Figure 36 and Table 3.  
The resistance to side force on locking plates shall be tested in accordance with 5.11.11.  
4.8.14  Resistance to pulling on locking plates  
This requirement applies to locking plates intended to operate with locks with an anti -separation function.  
The locking plate shall resist a pull force of F6 when held for 60 s, see  Figure 37 and Table 3. The resistance 
to pulling on locking plates shall be tested in accordance with 5.11.12.  
4.8.15  Resistance to lifting force on locking plates  
The locking plate shall resist a lifting force of F7 when held for 60 s, see Figure 38 and Table 3. The 
resistance to lifting force on locking plates shall be tested in accordance with 5.11.13  
Table 3 – Security requirements  
Sub 
clause  Requirement  Grade of security - attack resistance  
0 1 2 3 4 5 6 7 
4.8.2  Locking  Principle of the deadbol t operation  
4.8.3.2  Torque resistance of knob on bored lock and 
latch sets  M7 (Nm)  - 10 15      
Torque resistance of lever handle on bored 
lock and latch sets  M7 (Nm)  - 20 30      
4.8.3.3  Resistance to pulling off of knob on bored lock 
and latch sets  F8 (kN)  - 1 1.5      
4.8.5  Side force on deadbolt F4 (kN)  - 1 3 5 7 7 10 10 
Net drilling time for side force test  t (s) - - - - - 180 - 300  
18 © UNBS  yyyy – All rights reserved  
 Total drilling time for side force test  t (s) -     300  600 
4.8.6  Deadbolt projection without hook L1 (mm)  - 10 12 14 20 20 20 20 
Deadbolt projection with hooks H1 (mm)  - 5 5 5 5 5 5 5 
4.8.7  Disengaging force without box protecting 
locking plate  F5 (kN)  - 1 2 4 5 5 6 6 
Disengaging force without box protecting 
locking plate  F5 (kN)  - 1 2 2 2 2 2 2 
Resulting  projection  L2(mm)  - 8 10 11 17 17 17 17 
Resulting projection  d(mm)  - 3 3 3 3 3 3 3 
Net drilling time for disengaging force test  t(s) - 20 30   180 - 300 
Total drilling time for disengaging force test  t(s)      300 - 600 
4.8.8  Resistance for pulling  of anti -separation bolt  
(kN) - 1 3 5 7 7 10 10 
Net drilling time for resistance to pulling of anti -
separation bolt  t(s) -     180 - 300 
Total drilling time for resistance to pulling of 
anti-separation bolt  t(s) -     300 - 600 
4.8.9  Resistance to for cing of anti -lifting device in 
sliding door lock  F7 (kN)  - 
- 1 3 4 5 5 6 6 
Net drilling time resistance to forcing of anti -
lifting device in sliding door  t (s)      180 - 300 
Total drilling time resistance to forcing of anti -
lifting device in sliding d oor t (s)       300 - 600 
4.8.10.1  Torque resistance of lockable follower M5(Nm)  - 60 80 100 150 150 200 200 
4.8.10.2  Torque resistance of rim locks with an intergral 
lockable handle/knob M5(Nm)  M5(Nm) =1.0(kN) X maximum radius (mm)  
4.8.11  Strong key att ack on lever locks M6 (Nm)  - 15 30 100 100 100 100 100 
4.8.12  Resistance to force on box protected locking 
plate F5 (kN)     4 5 5 6 6 WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  19 
 4.8.13  Resistance to side force on locking plate 
F4(kN)   1 3 5 7 7 10 10 
4.8.1 4 Resistance to pulling force on locking plate 
F6(kN)   1 3 5 7 7 10 10 
4.8.15  Resistance to lifting force on locking plate 
F7(kN)   1 3 4 5 5 6 6 
 
5 Test,  assessment  and sampling  methods  
5.1 General  
Any model of a lock within any one product range having significantly different working component s, or  
working  components  of significantly  different  materials  or different  manufacturing  and assembly  methods  shall 
be considered  one type and its performance  separately  tested.  
The most  critical  types,  i.e. worst  case,  within  a product  range  are to be determined  by the manufacturer  and 
test laboratory.  
According to the force of single components or component groups the sample need to be chosen in the  
variation with weakest/least profile/cross section and/or the ones that have to sustain the highest  
forces/ moments.  
Should any variation be exposed to an even weaker profile/cross section, e.g. an asymmetric designed  
forend,  this variation  shall be chosen.  
The worst case condition shall be tested (i.e. that which produces the highest operating forces) and  relev ant 
details of  the sample  used  shall be noted  in the test report.  
Failure of any one test within a sequence constitutes failure of that particular test sample. In the case of  any 
one test sample failure, the relevant test sequence (see Annex B) shall be re peated on two further  samples. A 
second failure (of the original or repeat samples) means that the product has failed to meet  the standard.  After  
a second  failure  the manufacturer  shall show  evidence  of corrective  actions  undertaken  and a new complete  
type test is to be performed.  
The lock or latch shall be fitted to the test door/apparatus in accordance with the manufacturer’s  instructions.  
NOTE  The scope of  any particular  product  range can be determined  by the testing  authority  in discussion  with the 
manu facturer. This can involve examination of the construction of the various products involved and pre - testing of certain 
attributes in order to determine the most appropriate test samples to represent the product  range.  
Throughout  this Uganda  Standard,  the following  tolerances  shall apply,  unless  otherwise  specified.  
— mass  in kilograms or  grams (kg  or g): ± 5 %, 
— length  in millimetres  (mm):  ± 2 %, 
— force  in kilo Newton  or Newton  (kN or  N): ± 2 %, 
— torque  in Newton  metres  (Nm):  ± 5 %, 
— time  in seconds  (s): ± 10 %,  
20 © UNBS  yyyy – All rights reserved  
 
— temperature  in degrees  Celsius  (°C):  ± 2 °C. 
Unless  otherwise  specified,  forces  or torques  shall be applied  and raised  to the required  level within  (60 ± 
10) s and  shall be held there  for (60 ± 5) s. 
All relevant  tests  of the object  decided  by the manufac turer and  test laboratory  shall be performed with  the 
deadbolt  in its fully  thrown  position.  
The test apparatus shall be rigid enough to avoid influencing test measurements.  Figures  show  typical  
examples of  lock test-rig construction  or design.  
Where  speci fically  stated  in manufacturer’s  instructions  for the product,  alternative  materials,  additional  
support  as appropriate,  may be used.  
5.2 Test apparatus  
5.2.1  Test door  
The test door leaf shall be 2 100 mm high and 1 100 mm wide. It shall have means of att aching weights  to the 
door to enable the door mass  to be in the centre of the door. The test door and its  frame shall  have sufficient 
rigidity such that any distortion perpendicular to the plane of the test door, taking place  during  the test 
sequence  shall be no more  than 5 mm at any position.  
The distance between the forend and locking plate shall be (3 ± 1) mm, unless manufacturer specifies  
otherwise If the minimum distance between forend and locking plate is larger than 4 mm it should be in  the 
worst  case of the range  as specified  in the manufacturer’s  instructions.  
5.2.2  Drill machine  
The drilling machine shall have a power of 500 W to 700 W and a speed of 500 rpm to 800 rpm (see  Figure  
17) It shall be able to apply  a force  of (300 ±  25) N without  shock,  axially  to the drill. 
 
 
Figure  17 — Drilling  machine – Example  
5.2.3  Test fixtures  
Unless otherwise stated, the lock or locking plate shall be fixed to a 40 mm thick wooden or metal block  of 
sufficient height and depth to accommodate the product under te st without influencing the test  results.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  21 
 The fixture shall be equipped so the locks or locking plate’s ordinary wooden or metal screws supplied  by the 
manufacturer  can be used.  
The fixture shall also be equipped with arrangement to eliminate test of the st rength of the screw or  screw  
fixing  to the block.  
5.3 Test procedure  - Drilling  procedure  
The lock shall be mounted  in accordance  with the manufacturer's  instructions  in a suitable  test apparatus or in 
a 40 mm thick wooden block, for use with a drilling ma chine as described in 5.2.2 and  Figure  17. 
A high-speed  steel  drill, having  a maximum  diameter  of 5 mm.  A force  of (300 ± 25)  N shall be applied  without  
shock,  axially  to the drill. A maximum  of three  drills may be used  for each  test. No coolant  or lubrica tion shall 
be applied to the drill during the test. Drilling shall continue for the appropriate maximum net drilling time (t1) 
within the total time (t2) allowed for each test, including time taken to operate the deadbolt for verification.  
5.4 Test methods  - general  
5.4.1  Dangerous  substances  verification  
The manufacturer’s  statement  concerning  dangerous  substances  shall confirm  compliance  with 4.1.2.  
5.4.2  Return  force  of latch  bolt 
The lock shall be held in a vice or similar fixture with the forend vertic al. Using a suitable force gauge  
operating  in the same  direction  of movement  as the latch  bolt, the latch  bolt shall be depressed  fully with 
the force gauge, then allowed to extend until the leading edge of the bolt head is (2 ± 0,5) mm from  the face of 
the forend, at which point the return force on the latch bolt shall not be less than F1 = 2,5 N.  See Figure  1. 
5.4.3  Product  information  requirements  verification  
The information  requested  in 4.1.4  shall be checked  by the test laboratory.  
5.4.4  Strength  of lever lock key 
The lock shall be mounted in a suitable test apparatus with means for preventing the deadbolt from  moving 
more than (3 ± 1) mm from its withdrawn position. Apply the torque 2,5 Nm without shock to  the correctly  
inserted  key in  the bolt throwi ng direction.  Apply  the torque  gradually,  in a time of (5 ± 2) 
s. The lock shall operate  correctly  after this test conforming  to the requirements  of 4.2.2.  
5.4.5  Strength  of bolt action  
The locking  action:  The lock shall be mounted  in a suitable  test appar atus with means  for preventing  the 
bolt from moving more than (3 ± 1) mm from its withdrawn position. A torque of 30 Nm shall then  be applied,  
without  shock  to the follower  in the bolt throwing  direction  (see Figure  18). The torque  to be applied 
gradually,  in a time of (5 ± 2) s. The lock shall operate correctly after this test conforming to  the requirements  
of 4.2.2.  
The latch bolt action: The lock shall be mounted in a suitable test apparatus with means for preventing  the 
latch bolt from moving more than (3 ± 1) mm from its fully thrown position. A torque of 20 Nm shall  then be 
applied, without shock to the follower in the bolt withdrawing direction (see Figure 18). The  torque to be 
applied gradually, in a time of (5 ± 2) s. The lock shall operate correctl y after this test  conforming  to the  
requirements of 4.2.2   
22 © UNBS  yyyy – All rights reserved  
 
 
 
  
Figure  18 — Strength  of bolt action  
5.4.6  Minimum  follower  restoring  torque  
Using a suitable torque gauge and adapter(s), the latch bolt  shall be withdrawn via the follower and  allowed  to 
return  under  its own spring  force  (where  applicable)  until the follower  is within  5° of its back stop position, 
at which point the torque shall be at least 0,8 Nm, unless the manufacturer has  declared on the Product 
Information Sheet, (see 4.1.4) that the product is intended for use with spring  supported  furniture.  
5.4.7  Protection  against  removal  from  door  
Inspect all fixings to assess whether they are concealed and inaccessible when the door is closed. W ith the 
use of any of the tools for the screw heads listed in Figure 2, attempt to remove any fixings that are  exposed.  
5.5 Test methods  - Category  of use 
5.5.1  Resistance  to side force  on latch  bolt 
The lock shall be mounted as shown in Figure 19 or Figur e 20 with support of 5 mm on the brace and  the 
distance a to the centreline between follower and key rotation centre, using metal thread screws of  equivalent  
strength  to the fixing  means supplied/recommended  by the manufacturer.  
The choice to use either th e method from  Figure 19 without support for the forend of the brace or  Figure 20 
with forend support by the brace, for mounting should be stated by the manufacturer in the  product  
information,  see 4.1.4.  
The force  F2 shall be applied  to the securing  face of the latch  bolt using  a tool in accordance  with 
Figure  21 located  (3 ± 0,2) mm from the  forend  and be held for 60 s. 
The latch  action  shall not be affected  as a result  of this test.  
Dimensions  in millimetres  
WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  23 
 
 
 
Key   
1 lock  3 brace  without  support  of the forend  
2 tool  4 cover  plate  
Figure  19 — Resistance  to side force  on latch  bolt without  support  
Dimensions  in millimetres  
 
Key   
1 lock  3 brace  with  support  of the forend  
2 tool  4 cover  plate  
 
24 © UNBS  yyyy – All rights reserved  
 Figure  20 — Resistance  to side force  on latch  bolt with support 
 
  
Figure  21 — Force  application  tool to side force  on latch  bolt 
5.5.2  Torque  to operate  the lock 
5.5.2.1  The lock shall be fixed to a wooden block with the forend vertical. Using a torque gaug e and  
adaptor(s),  the latch  bolts  and/or  the deadbolt,  shall be withdrawn  until each  bolt head  is retracted.  
5.5.2. 2 Operate  the latch  bolt and/or  the deadbolt  using  the key. Operation  includes  the full sequence  
from insertion  to withdrawal  of key, during  which  operating  torque  M1 shall be measured  
5.5.2. 3 Operate the latch bolt and/or the deadbolt using the follower, during which torque M2 shall  be 
measured.  
5.5.3  Strength  of follower  stops  
The lock shall be attached  fixed  to a fixture  as in  5.2.3.  
The tor que M3 shall be applied without shock to the follower or integral knob/handle, using a suitable  torque  
gauge  and adapter(s),  in both clockwise  and anticlockwise  directions.  The torque  shall be applied  gradually  in 
a time period of  (5 ± 2) s. 
The lock shall  be tested in accordance with 5.5.2 so that the torque M1 and M2 to operate the lock  conform  to 
the grades given  in 4.2.2.  
5.5.4  Torque  resistance  for lockable  deadbolt  operation  by handle/knob  
The lock shall be fixed  according  to 5.2.3.  
The torque  M4 shall be applied  gradually  to the locked  handle/follower,  in both clockwise  and anticlockwise 
directions, in a time period of (5 ± 2) s (see Figure 22). The lock shall not be operable to  open  status.  
The lock shall be tested in accordance with 5.5.2 so that th e torque M1 and M2 to operate the lock  conform  to 
the grades given  in 4.2.2.  
WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  25 
 
 
Key 
1 fixture  
2 lock  or tubular  lock  
Figure  22 — Torque  resistance  of lockable  follower  
5.6 Test methods  - durability  
5.6.1  Durability  of latch  action  without  force  applied  
This test method  is applicable  for classification  of durability  grade  A, B and C. 
This test can be omitted  if the latch  action  is subjected  to the same  number  of cycles  (or more)  in 5.6.2.  
The durability test of the deadbolt mechanism and latch bolt mechanism may be combined in the same  test. 
The minimum number  of required  cycles  shall be performed  in accordance  with Table  2. 
The lock and its correct locking plate shall be mounted on a test door and frame in accordance with 5.1  with a 
gap of (3 ± 1) mm, as shown in  Figure 23, together with a representative set of lever handle or  knob  furniture.  
Each  complete  test cycle  shall be  as follows  
a) rotate the lever handle, knob or key to fully withdraw the latch bolt with a maximum torque of 10  Nm 
on the lever  handle  or knob  or 5 Nm on  the lever  lock key or the key for the dummy  cylinder;  
b) open  the door a  distance  of (200 ±  5) mm; 
c) allow  the handle  to return  or bring  the key to the ‘at rest’ position;  
d) let the door close under the influence of force F10 = 7 N, causing the latch b olt to strike and fully  
engage in the locking plate. If 7 N is an insufficient force to close the door and engage the latch bolt  in 
the locking plate, a new F10 shall then be determined by measuring the force required and  increasing 
the new force F10 by 20  %, up to a maximum of 50 N for the durability test, causing the  latch  bolt to 
strike  and fully engage  in the locking  plate.  
The operation  speed shall  be 10  cycles per  minute  maximum.  
For shared  latch  action  where  the latch  can be operated  both by the key and the follower  independent of each 
other, operation with the key shall be tested first followed by operation with  the follower.  
a) For latch action where the follower or the key can operate first the deadbolt  
26 © UNBS  yyyy – All rights reserved  
 and then the latch in  the same sequence, the com plete sequence shall be 
carried out first with the number equal to the  number  for deadbolts.  
Thereafter,  the sequence  shall  only  include  the withdrawal  of the latch  bolt.  
b) For locks with classification grade L, M, R, S, W and X, the cycles of only the 
latch  operation shall be  done  as in 5.6.2.  
The components  can be cleaned  and lubricated  without  dismantling  the lock from the door at the start of the 
test and after each 5 000 cycles, in accordance with the manufacturer’s instructions. Any cleaning  and 
lubrica tion shall be recorded  in the test report.  
All alike keys  supplied by the manufacturer can be used for durability testing. One new key shall be  used  to 
check  the operating  torque  M1. 
After the complete numbers  of cycles  the same lock shall be tested in acc ordance with 5.5.2  to verify  that the 
operation  torque  M1 and M2 fulfil the requirement  of 4.2.2  followed  by a test 5.7.2  to verify  that the closing  
force  F9 is still  within  the classified  grade  of 4.4.2.  
Dimensions  in millimetres  
 
Key 
1 test door  
2 frame  
3 lock 
Figure  23 — Durability  of latch  action  without force  applied  
5.6.2  Durability  of latch  action  with force  applied  
This test method  is applicable  for classification  of durability  L, M, R, S, W and X. 
The durability  test of the deadbolt  mechanism  and latch  bolt mechanism  may be combined  in the same  test. 
The minimum number  of required  cycles  shall be performed  in accordance  with Table  2. 
The lock or latch  and its correct  locking  plate  shall be mounted  as described  in 5.2.1  In addition  there  shall 
be provisio n for applying  a side force  F3, as shown  in Figure  24. 
Each  complete  test cycle  shall consist  of the following:  
a) apply  force  F3, to the test door,  in the opening  direction  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  27 
 b) rotate the lever handle, knob or key to fully withdraw the latch bolt with a maximum  torque of 10  
Nm on  the lever  handle  or knob  or 5 Nm on  the lever  lock key or the key for the dummy  cylinder;  
c) open  the door a distance  of 200 mm ±  5 mm; 
d) allow  the handle  to return  or bring  the key to the ‘at rest’ position;  
e) remove  force  F3; 
f) let the door to  close under influence of Force F10 = 7 N, causing the latch bolt to strike and fully  
engage  in the locking  plate.  If 7N is an insufficient  force  to close  the door and engage  the latch  
bolt in the locking plate, a new F10 shall then be determined by measur ing the force required and  
increasing the new force F10 by 20 % up to a maximum of 50 N for the durability test, causing the  
latch  bolt to strike  and fully engage  in the locking  plate.  
The operation  speed shall  be 10  cycles per  minute  maximum.  
a) For shared  latch  action  where  the latch  can be operated  both  by the key and 
the follower  independent of each other, operation with the key shall be 
tested first followed by operation with  the follower.  
b) For latch action where the follower or the key can operate first t he deadbolt 
and then the latch in  the same sequence, the complete sequence shall be 
carried out first with the number equal to the  number  for deadbolts.  
Thereafter,  the sequence  shall  only  include  the withdrawal  of the latch  bolt.  
The components  can be cleaned  and lubricated  without  dismantling  the lock from the door at the start of the 
test and after each 5 000 cycles, in accordance with the manufacturer’s instructions. Any cleaning  and 
lubrication  shall be recorded  in the test report.  
All alike keys  suppl ied by the manufacturer can be used for durability testing. One new key shall be  used  to 
check  the operating  torque  M1. 
After the complete number of cycles the same lock shall be tested in accordance with 5.5.2 to verify that  the 
operation torque M1 and M2  meet the requirements of 4.2.2, followed by the test in 5.7.2 to verify  that the 
closing  force  F9 is still  within  the classified  grade  of 4.4.2.  
Dimensions  in millimetres  
 
Key 
1 test door  
2 frame  
3 lock   
Figure  24 — Durability  of latch  action with  force  applie d 
  
28 © UNBS  yyyy – All rights reserved  
 5.6.3  Durability  of deadbolt  mechanism  
The lock shall be mounted with its forend vertical, see Figure 25. The test apparatus shall be capable of  key 
rotation, and of inserting and withdrawing the key from the lock. Where it is possible to determine  which the 
outward  facing  side of the lock is, the key shall be inserted  from this  side.  
Each  complete test  cycle  shall be as  follows:  
a) insert  the key into the lock; 
b) rotate  the key sufficiently  to fully throw  and detain  the deadbolt;  
c) withdraw  the key from the  lock; 
d) re-insert  the key into the lock, and rotate  it fully to withdraw  the deadbolt  (and latch  bolt if shared  
action);  
e) withdraw  the key from the  lock. 
Where the latch bolt has a shared latch action that can only be withdrawn by the key, the above test  cycle  
shall be modified  as follows:  
a) insert  the key into the lock; 
b) rotate  the key sufficiently  to fully withdraw  the spring  bolt; 
c) rotate  the key in the reverse  direction,  allowing  the bolt to return  to the ‘at rest’ position;  
d) withdraw  the key from the  lock. 
This test shall be conducted with the maximum the number of keys that are delivered with the lock as  
described  in the manufacturer's instructions.  
For operating  the bolt(s)  a maximum  torque  of 1,5 Nm is allowed.  
If the key operates both deadbolt(s) and latchbol t(s) the test cycle shall include the complete sequence  for bolt 
action(s).  
In the withdrawn position, the key may remain in the key guide, provided that it is not in contact with  the 
detaining  elements (levers,  pins,  etc.).  
Where  the lock is designed  to be used  in conjunction  with a cylinder,  the test apparatus  shall be  required only 
to fully throw and withdraw the deadbolt (or fully withdraw/release the latch bolt, where  this provides the 
security), operating the bolt of the lock via a simulated cylinder without taking the  ”cylinder  key” in and out. 
The operation  speed  shall be up to 15 cycles  per minute.  
NOTE  For locks  with keys with only one detaining  element  it is not  necessary  to insert  and withdraw  the key WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  29 
 
 
Key 
1 lock  
2 cylinder  or lever  lock  key 
3 couplin g 
Figure  25 — Durability  of deadbolt mechanism  
5.6.4  Durability  of locking  snib mechanism  
The lock or latch shall be mounted on a suitable fixture providing either a sliding or partial rotary action  
depending upon the design of the snib mechanism. One test  cycle shall consist of moving the snib in  
accordance  with its function  from the  unlocked  to the locked  position  and back  to unlocked.  
The operation  speed  shall be up to 60 cycles per  minute.  
5.7 Door  mass  and closing  force  
5.7.1  Door  mass  verification  
Verification  shall be carried  out to ensure  that the test door conforms  to 7.2.3.  
5.7.2  Door  closing  force  
The lock or latch  and its correct  locking  plate  as defined  by the manufacturer  shall be fitted  to a test door 
and frame  as shown  in Figure 26.  
The latch  and the locking  plate  shall be cleaned  before  each  test. 
The distance between the lock and the locking plate shall be (3 ± 1) mm. The door shall be opened so  that the 
latch bolt is in contact with the locking plate and allowed to close under the influence  of F9. The  test shall be 
conducted three times, during which the latch bolt shall correctly engage the locking plate  every  time.  
The test shall be done  after the durability  test with the same  specimen.   
30 © UNBS  yyyy – All rights reserved  
 Dimensions  in millimetres  
 
Key 
1 test door  
2 frame  
3 lock  
Figure  26 — Door  closing  force  
5.8 Suitability  for use on fire resistance  and/or  smoke  control  doorset  
See Annex  A. 
5.9 Safety  
Not applicable  
5.10 Corrosion  resistance  and temperature  
5.10.1  Corrosion  resistance  
The lock shall be mounted in a fixture simil ar to a door application and subjected to a neutral salt spray  test, 
as detailed in 5.2.3 after which, it need only comply with 5.3, to determine  its ability  to operate  after 
environmental  exposure.  The duration  of the test is determined  by the grading  as follows:  
The lock shall be operated once every 24 h during the test for grade A, C and F.  The lock shall be operated  
once  every  60 h during  the test for grade  D and G. 
Immediately following the neutral salt spray test and cleaning of the lock, the lock sha ll be subjected to  the 
tests specified in 5.4.2 (Return force of latch bolt), 5.5.2 (Torque to operate the lock) and5.7.2 (Door  closing 
force). The lock shall be operated 20 times. The opening force shall be measured and recorded  during  the 
final three  cycles. 
5.10.2  Operation  at extremes  of temperature  
The lock shall be stabilized before the test by subjecting it to a constant temperature of 20°C ± 5°C and a  
relative humidity of 60 % ± 5 % for a period of at least 1 h. The key shall be kept separately at n ormal  room  
temperature  during  the tests.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  31 
 The lock shall be cooled  gradually  by decreasing  the temperature  at a rate of 10° C ± 1 °C per hour until a 
temperature of - 10 °C ± 1 °C is attained. The test temperature shall be maintained for a minimum of  10 min  
and a maximum of 20 min. After this period the lock shall be operated with its correct key at  least  once  (within  
5 attempts)  in the laboratory  at ambient  temperature  within  5 min 
The lock shall be heated at the minimum rate of 10°C ± 1°C per hour until th e required temperature of +  60°C 
is reached. The test temperature shall be maintained for a minimum of 2 h and at the end of this  time each  
lock shall be operated:  
a) by its correct  key to fully throw  and withdraw  the deadbolt;  
b) through  its follower  to operate  the latch  bolt, ensuring  that it extends  to its fully thrown  position;  
c) where applicable, to manually check that any anti -thrust slide has freedom of operation.  Operating  
torques is to  be recorded  within  20 min following  the stabilizing  time.  
5.11 Security  
5.11.1  Key operation  and locking  
5.11.1.1  Manual  locking  
It shall not be possible to remove the key from the lock unless the deadbolt is in its unlocked or fully  thrown 
and deadlocked position. The deadbolt shall be operated from the fully unlocked to ful ly thrown  and 
deadlocked position with a live end force of 15 N applied ensuring that the deadbolt is deadlocked  with an end 
load of F5 (see Table  4). 
Indicators for dead locking the bolt shall be tested, indicating that the deadbolt has not reached its  deadlocked  
position  and that the key has been  removed.  
5.11.1.2  Manual locking with intermediate locking positions  
It shall not be possible to remove the key from the lock before the deadbolt is properly deadlocked. The  
deadbolt shall be operated from the fu lly unlocked position to each key removable position with a live  end 
force of 15 N applied ensuring that the deadbolt is deadlocked with an end force of F5 in each  position  with 
the key inserted.  
Indicators for dead locking the bolt shall be tested, indica ting that the deadbolt has not reached its  deadlocked  
position  and that the key has been  removed.  
5.11.1.3  Automatically locking deadbolt  
The lock and its locking plate shall be installed on the test door in accordance with the manufacturer's  
instruction  but with a gap of 5 mm between  forend  and locking  plate.  
With the test door open at 5°, apply a closing force of 50 N at right angles to the face of the test door at a  
position  of 1 000 mm from the centre  line of the hinges  of the test door,  and between  800 mm and 1 200 
mm from  the bottom of  the test door to re-engage  the lock in the secured  position.  
Verify that the deadbolt has reached its fully thrown and deadlocked position. Indicators for dead  locking  the 
bolt shall be tested,  indicating  that the deadbo lt has not reached  its deadlocked  position.  
Retract  the latch  bolt and the deadbolt  by key operation  and verify  that the deadbolt  has reached  its fully 
withdrawn  position  before  the latch  bolt disengages  from the  locking  plate.  
If the lock allows retractin g simultaneously the latch bolt and the deadbolt by handle or knob operation,  then 
repeat  this test  using  the handle  or knob.   
32 © UNBS  yyyy – All rights reserved  
 These  tests  shall be conducted  three  times.  
NOTE  The fully withdrawn  position  of the  deadbolt  is the one from which  it will need  to be released  
5.11.1.4  Automatically  locking  latch  bolt 
The lock or latch  and its locking  plate  shall be installed  on the test door in accordance  with the manufacturer's  
instruction  but with a gap of 5 mm  between  forend  and locking  plate.  
With the test doo r open at 5°, apply a closing force of 50 N at right angles to the face of the test door, at a  
position of 1 000 mm from the centre line of the hinges of the test door and at between 800 mm and 1  200 mm 
from the bottom  of the test door to re-engage  the lock or latch  in the secured  position,  check  the 
deadlocking  function  of the latch bolt.  
Indicators for dead locking the bolt shall be tested, indicating that the deadlocking of the latch bolt has  not 
reached  its deadlocked  position.  
5.11.2  Torque  resistance  of knob  of tubular  lock test 
5.11.2.1  Torque  resistance  of knob  or lever  handle  on bored  lock and latch  sets 
The lock shall be mounted on a suitable fixture and, by means of a suitable adapter, a torque M7 applied  to the 
locked  knob,  in both directions wit hout forcing  the lock open.  
5.11.2.2  Resistance to pulling off of knob on bored lock and latch set  
The bored lock or latch set shall be mounted in a suitable fixture as shown in Figure 27 and an axial  force  F8 
applied  to the  knob  for a period  of 60 s 10 s 
 
Key 
1 pulling  tool  
2 tubular/bored  lock  set 
3 fixture  
Figure  27 — Pulling  off knob  on bored  lock WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  33 
 0 5.11.3  Resistance  to side force  
5.11.3.1  Resistance  to side force  on deadbolt  
The choice of test rig (see Figure 28, 29 or 30) shall be determined by the manufact urer’s declaration in  4.1.4  
The lock shall be mounted with support of 5 mm on the brace and by a steel plate where the plate is not  
allowed to have a distance “a” to cover more of the lock than to the centreline between the key rotation  centre  
and the centre of the follower.  
For rim locks  the fixture (3) in Figure 30 shall  be placed on the  braces for  testing in fixture  as in Figure  28. 
A side force F4 shall be applied by using a tool in accordance with Figure 21 to the deadbolt. The  distance  
between  the tool and the forend  shall be (3 ± 0,2) mm and the force  shall be held for a period  of 60 s 10 s. 
At no time during the test shall the tool be permitted to slip away from the deadbolt due to deformation  or 
collapse  of the bolt or lock. 
If the design of the lock allows, force shall be applied to the deadbolt from both sides, tested on separate  
locks. 
Dimensions  in millimetres  
 
Key   
1 lock  3 brace  without  support  of the forend  
2 tool  4 cover  plate  
 
Figure  28 — Resistance  to side  force  on dead  bolt  without  support  
Dimensions  in millimetres   
34 © UNBS  yyyy – All rights reserved  
 
 
Key   
1 lock  3 brace  with  support  of the forend  
2 tool 4 cover  plate  
Figure  29 — Resistance  to side force  on dead  bolt with support  
 
Key 
1 lock  3 fixture  to be placed  in Figure 28  
2 tool  
Figure  30 — Side  force  on rim lock 
5.11.3.2  Resistance  to drilling  and side force  on deadbolt  test 
Use the drilling  procedur e described  in 5.3. 
Drilling shall continue for the appropriate maximum net drilling time (t1) within the total time (t2)  specified  in 
Table  3. 
As much as possible of the security bolt shall be drilled away immediately outside the forend in the net  time 
allowed. The lock shall then be mounted in the test apparatus as shown in Figure 28 or Figure 29  and with a WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  35 
 side force F4, with a tool according to Figure 21 applied to the drilled side of the bolt. The  distance  between  
the tool and the forend  shall be 3 mm  ± 0,2 mm. 
At no time during  the test shall the tool be permitted  to slip off the deadbolt  due to deformation  or 
collapse  of the bolt or lock. 
Locks  shall be tested  from both sides  (on separate  locks)  unless  indicated  otherwise  in the product  
information  as in 4.1.4.  
5.11.4  Deadbolt projection measure  
The projection  L1 shall be measured  perpendicular  to the forend  on the unloaded  deadbolt  for the linear 
or rotating bolt. The design of the bolt end may have different shapes but the projection is always  the 
maximum distance  perpendicular  to the forend  to the bolt end. 
The projection  H1 shall be measured  perpendicular  to the horizontal  line 0 – 0 that is placed  on the bolts 
highest horizontal level. The anti -separation function may have different design but the projection  shall be 
measured  at the point  on the bolt that is parallel  with 0-line and perpendicular  to the forend  
The projection of the linear or rotating bolt with hook (anti -separation function) shall be measured  
perpendicular  from the  horizontal  part of the bolt. 
5.11.5  Resistance  to forcing  in the unlocking  direction  (disengaging  force)  test 
5.11.5.1  Resistance  to disengaging  force  test 
The lock with a linear  operating  deadbolt  shall be mounted  in a test apparatus,  as shown  in Figure  31, or 
Figure  32 or as defined  by the manufacturer  (see the product  information  4.1.4  in which  the projection of the 
deadbolt can be measured). Add the pre -force of 50 N on the bolt to find the zero for  the measure.  Increase  
during  60 s the disengaging  force  to the value  F5 depending  on the grade  in the direction  of unlocking  to 
the locked  deadbolt  and hold it for a period  of 60 s 10 s the resulting projection  L2 shall be noted.  
If the deadbolt  has more  than one end (finger  bolt) the force  shall be applied  to all the ends  at the test. 
At no time during the test shall the tool be permitted to slip off the deadbolt due to deformation or  collapse  of 
the bolt or lock. 
The lock with rotating  deadbolt  shall be mounted  in a test apparatus,  as shown  in Figure  33 in which  the 
movemen t of the hooked deadbolt can be measured. Add the pre -force of 50 N on the bolt 3 mm  from the 
forend  to find  the  zero for the  measure.  Increase  during  60 s the force  to the value  F5 
depending  on grade  in the direction  of unlocking  and hold it for a perio d of 60 s 10 . The deformation  d shall  
be measured  during  the application  of the force  and shall be less than 3 mm .  
When  the locking  bolt has a movement  for opening  that is not linear  the disengaging  force  shall follow  the 
movement  of the bolt to its ope ning position.  
If the lock is intended  for use with a cylinder,  a suitable  cylinder  or dummy  cylinder  shall be fitted  for the 
test. 
Locks with manual locking with intermediate locking positions shall be tested with the bolt fully thrown  and 
deadlocked.  
5.11.5.2  Resistance to disengaging force with drilling  
Use the drilling  procedure  described  in 5.3.  
36 © UNBS  yyyy – All rights reserved  
 Drilling shall continue for the appropriate maximum net drilling time (t1) within the total time (t2)  specified  in 
Table  4. 
Drilling shall be directed towards any elements in the lock in an attempt to drill them away and allow  the 
deadbolt to be withdrawn and/or towards the vulnerable fixing elements in an attempt to remove  them  and 
allow  the lock to be separated  from the block.  It shall not be possible  to opera te the deadbolt  
driving  element  of the lock to the opening  position by  means  of a suitable  tool using  a maximum  torque  of 5 
Nm. 
Where  vulnerable  elements  are protected  by furniture,  the drilling  test may be omitted  for that particular  area.  
Such  omissions shall be recorded  in the test report.  
The method  for testing  and measure  the projection  L2 of deformation  d shall follow  the test method  of 5.11.4.  
Dimensions  in millimetres  
 
 
Key 
1 fixture  
2 lock  
 
Figure  31 — Disengaging  force  without  support  
Dimensions  in millimetres  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  37 
 
 
Key 
1 fixture  
2 lock  
3 support  
Figure  32 — Disengaging  force  with support  
Dimensions  in millimetres  
 
Key 
1 lock  cylinder  
2 plate  
3 lock  case   
38 © UNBS  yyyy – All rights reserved  
 4 tool  
5 fixture  
 
Figure  33 — Disengaging  force  of anti-separation  bolt 
5.11.6  Resistance  to pulling  of anti-separati on bolt test  
5.11.6.1  Resistance  to pulling  of anti-separation bolt  test 
The lock shall  be mounted  in a suitable  fixture  as shown  in Figure 34, using  metal  thread screws  
supplied/recommended by the manufacturer and a fixing plate to support the fixing scre ws during the  test. 
Add a tensile  force  F6 to the engaging  part of the bolt with a tool (see Figure  34) and hold for a period of 
60 s 10 . The tool shall be guided  to avoid  vertical  movement.  
At no time during the test shall tool be permitted to slip off the deadbolt due to deformation or collapse  of the 
bolt or lock. 
5.11.6.2  Resistance to drilling and pulling of anti -separation bolt t est 
Use the drilling  procedure  described  in 5.3. 
Drilling  shall continue  for the appropriate  maximum  net drilling  time (t1) within  the total time (t2) specified  
in Table  3. 
As much  as possible  of the security  bolt shall be drilled  away  immediately  outside  the forend  in the net time 
allowed.  
The lock shall  be  mounted  in a suitable  fixture  as shown  in Figure  34, using  metal  thread  screws  
supplied/recommended  by the manufacturer  supported  with a plate.  
Add a tensile force F6 to the engaging part of the bolt with a tool (see Figure 34) and hold for a period of  60 s 
10 . The tool shall be guided  to avoid  vertical  movement  
At no time during  the test shall the tool be permitted  to slip off the deadbolt  due to deformation  or 
collapse  of the bolt or lock. 
Dimensio ns in millimetres  
 
Key 
1 lock  cylinder  4 tool  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  39 
 2 plate  5 fixture  
3 lock  case  
Figure  34 — Pulling  of anti-separation  bolt 
5.11.7  Resistance  to forcing  of locating  device  in sliding  door  locks  
5.11.7.1  Resistance  to forcing  of locating  device  in sliding  door  locks  
The lock shall be mounted  as for test 5.11.5  and a force  F7 applied  3 mm  from the forend  on the device  in 
the direction  as shown  in Figure 13.  
The force  shall be held for a period  of 60 s 10 s. 
At no time during  the test shall the tool be permitted  to slip off the device  due to deformation  or 
collapse  of the device  or lock 
5.11.7.2  Resistance to forcing of locating device with drill protection in sliding door locks  
Use the drilling  procedu re described  in 5.3. 
As much  as possible  of the locating  device  shall be drilled  away  immediately  outside  the forend  in the net 
time allowed.  
The lock shall be mounted  as for test 5.11.5  and a force  F7 applied  3 mm  from the forend  in the locking 
direction  of the bolt as shown  in Figure 13  for a period  of 60 s 10 s. 
5.11.8  Torque  resistance  for lockable  deadbolt  operation  by handle/knob  test 
The torque  M5 shall be applied  gradually  to the locked  handle/follower,  in both clockwise  and anticlockwise  
directions,  in a time period  of 5 s ±  2 s. The lock shall not be operable  to open  status.  
5.11.9  Strong  key attack  on locks  with internal  blocking  elements  
The lock with its accessories  shall be mounted  to a test block  as described  in 5.2.3.  
A key shaped tool made of tool steel, that can fit in the lock keyway without enlarging it, is pushed in the  lock 
and rotated  in the bolt withdrawing  direction  trying  to force  the lock open  as illustrated  in Figure  15. 
The torque  M6 is to be applied  gradually  in a time period  of 5 s ± 2  s. 
It is not necessary to reach the torque M6 if the lock has a protective mechanism, which breaks or  isolates  
during  a strong  key attack  in order  to prevent  the lock being  forced  open.  
The lock does not  need  to be operable  after the test. 
The tool representing the strong key shall be manufactured to be able to insert the torque of 100 Nm  into the 
lock. If the dimension of the key hole is designed that it is not possible to reach 100 Nm because  the tool is 
destroyed,  the lock has passed  the test and the torque  shall be registered.  
5.11.10  Resistance  to end force  on box  protected  locking  plate  test 
The locking  plate  shall be mounted  in a test apparatus (as  shown  in Figure  35) in which:  
a) the deformation  under  the tool to apply  the force  can be measured;  and  
40 © UNBS  yyyy – All rights reserved  
 b) a force  F5 can be applied  centrally  to the surfac e of the box or where  the deadbolt/anti -
separation  bolt works (if  known),  in three  directions X,  Y and Z 
c) and be held for a period  of 60 s 10 s. 
Add a perforce of  50 N to create  the Zero level.  Increase  the force  in 60 s and  hold it for 60 s 
The deflection  under  test is to be measured  in the area where  the deadbolt/anti -separation  bolt is 
located.  
The force in Z direction is to test the fixi ng of the box, deflection information is not required.  Force  F5 is applied  
with a tool having  a surface  of 5 mm x  20 mm. 
NOTE  Separate  locking  plates  for each  tested  direction.  
 
Figure  35 — Force  on locking  plate  box 
5.11.11  Resistance  to side force  on locking  plate  test 
The locking  plate  shall be mounted  with 5 mm clearance  in a metal  fixture  to a suitable  test apparatus  using  
machine  screws  of equivalent  strength to the fixings  supplied/recommended  by the manufacturer shown in 
Figure 36 or as defined by the manufacturer.  
A side force F4 shall be applied to the bolt  aperture  for a period  of 60 s 10 s, using  a tool which  represents  
the deadbolt  of an appropriate  lock. If the locking plate has several apertures or apertures intended for 
several locking bol ts, each aperture is  tested separately on different samples. If the locking plate breaks or 
bends, so that the force F4 cannot  be reached  or the tool slips off  from the aperture,  the requirement  is not  
met 
 WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  41 
 Figure  36 — Side  force  on locking  plate  
5.11.12  Resistance  to pulling  on locking  plate  
The locking plate shall be mounted with 5 mm clearance in a metal fixture to a suitable test apparatus  using 
machine screws of equivalent strength to the fixings supplied/recommended by the manufacturer  as shown  in 
Figure 37. A pull force  F6 shall be applied  to the bolt aperture  for a period  of 60 s 10 s, using  a tool 
representing  the hook/claw  bolt of an appropriate  lock. 
If the locking plate has several apertures or apertures intended for several locking bolts, each  locking  point is 
tested separately on different samples. If the locking plate breaks or bends, so that the force F6  cannot  be 
reached  or the tool slips off from the  aperture,  the force  reached  is recorded.  The tool shall be guided  to 
ensure  the linear  direction  of pull force.  
 
Figure  37 — Pulling  force  on locking  plate  
5.11.13  Resistance  to lifting  force  on locking  plate  
5.11.13.1  The locking plate shall be mounted with 5 mm clearance in a metal fixture to a test apparatus 
using  machine screws of equivale nt strength to the fixings supplied/recommended by the manufacturer as  
shown  in Figure  38.  
5.11.13.2  The locking  plate  shall have  support  of the fixture  in the lifting  direction  and a lifting  force  F7 
is applied  to the locating  device  aperture  in the locking plate  for a period  of 60 s  10 s, using  a tool 
representing  the locating  or hook  bolt device  of an appropriate  lock. 
5.11.13.3  If the locking  plate  has several  apertures  for locating  devices  or deadbolt,  each  of them  is tested  
separately  on different  samples.  
5.11.13.4  If the locking plate  breaks  or bends,  so that the force  F7 cannot  be reached  or the tool slips off 
from the aperture  then the requirements  is not  met.  
42 © UNBS  yyyy – All rights reserved  
 
 
Figure  38 — Lifting  force  on locking  plate  
5.12 Key related  security  for lever  locks  
5.12.1  Detaining  elements  verification  
Visual  check  based  on the manufacturer's  technical  documentation.  
5.12.2  Effective  differs  verification  
The number  of effective  differs  shall be assessed  with reference  to the manufacturer’s  differs  charts  
and/or  to supporting  documentation  demons trating  the principle  of calculation.  
5.12.3  Differing  step heights  on key 
The differing  step heights  on keys shall be assessed  with reference  to the manufacturer's  differs  charts  
and/or  to supporting  documentation  demonstrating  the principle  of calculatio n. 
5.12.4  Non-interpassing  of keys  with just one interval  differ  
Attempt  to operate  locks  with keys differing  by one interval  (up and down)  in just one lever/pin  position  
using  an applied  torque  on the key bow of 1,5 Nm, to confirm that  inter passing  will not occur.  
For locks in  grades E,  F G and H, see Table  4, this test shall be conducted  after the durability  test 5.6.3.  
5.12.5  Coding  protection  
Visual  check  based  on the technical  documentation  
6 Assessment and verification of constancy of performance – AVCP 
6.1 General  
The compliance of mechanically operated locks with the requirements of this standard and with the 
performances declared by the manufacturer in the DoP shall be demonstrated by  
a) determination of the product  type;  
b) factory production control by  the manufacturer, including product  assessment.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  43 
 The manufacturer shall always retain the overall control and shall have the necessary means to take 
responsibility for the conformity of the product with its declared performance(s).  
6.2 Type  testing  
6.2.1  General  
All performances related to characteristics included in this standard shall be determined when the 
manufacturer intends to declare the respective performances unless the standard gives provisions for 
declaring them without performing tests. (e.g. us e of previously existing data, CWFT and conventionally 
accepted performance).  
Assessment previously performed in accordance with the provisions of this standard, may be taken into 
account provided that they were made to the same or a more rigorous test met hod, under the same AVCP 
system on the same product or products of similar design, construction and functionality, such that the results 
are applicable to the product in question.  
NOTE 1 Same AVCP system means testing by an independent third party under th e responsibility of a notified 
product certification body.  
For the purposes of assessment, the manufacturer's products may be grouped into families, where it is 
considered that the results for one or more characteristics from any one product within the fam ily are 
representative for that same characteristics for all products within that same family.  
NOTE 2 Products may be grouped in different families for different characteristics.  
Reference to the assessment method standards should be made to allow the sele ction of a suitable 
representative sample.  
In addition, the determination of the product type shall be performed for all characteristics included in the 
standard for which the manufacturer declares the performance:  
a) at the beginning of the production of a n ew or modified mechanically operated lock or locking 
plate unless a member of the same product range,  or 
b) at the beginning of a new or modified method of production (where this may affect the stated 
properties);  
c) or 
d) they shall be repeated for the appropriate  characteristic(s), whenever a change occurs in the 
mechanically operated lock or locking plate design, in the raw material or in the supplier of the 
components, or in the method of production (subject to the definition of a family), which would 
affect sig nificantly one or more of the  characteristics.  
Where components are used whose characteristics have already been determined, by the component 
manufacturer, on the basis of assessment methods of other product standards, these characteristics need not 
be re -assessed. The specifications of these components shall be documented.  
Products bearing regulatory marking in accordance with appropriate harmonized Uganda  specifications may 
be presumed to have the performances declared in the DoP, although this does not r eplace the responsibility 
on the uncontrolled door closing devices manufacturer to ensure that the mechanically operated lock or 
locking plate as a whole is correctly manufactured and its component products have the declared performance 
values.  
Test sample s, testing and compliance  criteria  
The number of samples of mechanically operated locks and locking plates for use fire resisting and/or smoke 
control doorset to be tested/assessed shall be in accordance with Table 5.   
44 © UNBS  yyyy – All rights reserved  
 Table 5 — Number of samples to be test ed and compliance criteria  
Characteristic  Product 
characteristic  Assessment 
method  No. of 
samples  Compliance 
criteria  
Self-closing  
Ability to close and keep the door 
in a closed position      
- Return force of latch  bolt  4.1.3  5.4.2  1 4.1.3  
- Door closin g force  4.4.2  5.7.2  1 4.4.2  
Durability of self -closing against 
aging and degradation      
- Durability of latch  action  4.3.1  5.6.1  1 4.3.1  
- Corrosion  resistance  4.7.1  5.10.1  1 4.7.1  
Suitability for use on fire 
resistance and/or smoke 
control doorset  4.5 5.8 
Annex A  1 4.5 
Dangerous substances  4.1.2  As required by regulations  
6.1.1  Test reports  
The results of the determination of the product type shall be documented in test reports. The manufacturer 
shall retain all test reports  for at least 10 years after th e last date of production of the mechanically operated 
lock to which they relate . 
6.1.2  Shared other party  results  
A manufacturer may use the results of the product type determination obtained by someone else (e.g. by 
another manufacturer, as a common service to  manufacturers, or by a product developer), to justify his own 
declaration of performance regarding a product that is manufactured according to the same design (e.g. 
dimensions) and with raw materials, constituents and manufacturing methods of the same kin d, provided  that: 
1. the results are known to be valid for products with the same essential characteristics relevant for 
the product  performance;  
2. in addition to any information essential for confirming that the product has such same 
performances related to sp ecific essential characteristics, the other party who has carried out the 
determination  of the product  type concerned  or has had it carried  out, has expressly  accepted  
(see1)) to transmit to the manufacturer the results and the test report to be used for t he latter’s 
product type determination, as well as information regarding production facilities and the 
production control process that can be taken into account for  FPC;  
3. the manufacturer using other party results accepts to remain responsible for the produ ct having  
the declared performances and he  also: ensures that the product has the same characteristics 
relevant for performance as the one that has been  subjected  to the determination  of the product  
type,  and that there  are no significant  differences with r egard to production facilities and the 
production control process compared to that used for the product that was subjected to the 
determination of the product type;  and 
4. keeps available a copy of the determination of the product type report that also contai ns the 
information needed for verifying that the product is manufactured according to the same design  
and with raw materials, constituents and manufacturing methods of the same  kind.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  45 
 6.2.5 Cascading determination of the product type results  
For some constr uction products, there are companies (often called “system houses”) which supply or ensure 
the supply of, on the basis of an agreement (see 2)), some or all of the components (e.g. in case of windows: 
profiles, gaskets, weather strips) (see 3)) to an assem bler who then manufactures the finished product 
(referred to below as the “assembler”) in his  factory.  
1) The formulation of such an agreement can be done by licence, contract, or 
any other type of written consent.  
2) This can be, for instance, a contract, licen se or whatever kind of written 
agreement, which should also contain clear provisions with regard to 
responsibility and liability of the component producer (system house, on the 
one hand, and the assembler of the finished product, on the other  hand.  
3) These c ompanies may produce components but they are not required to do  so. 
Provided that the activities for which such a system house is legally established include 
manufacturing/assembling of products as the assembled one, the system house may take the responsib ility 
for the determination of the product type regarding one or several essential characteristics of an end product 
which is subsequently manufactured and/or assembled by other firms in their own factory.  
When doing so, the system house shall submit an “a ssembled product” using components manufactured by it 
or by others, to the determination of the product type and then make the determination of the product type 
report available to the assemblers, i.e. the actual manufacturer of the product placed on the  market.  
To take into account such a situation, the concept of cascading determination of the product type might be 
taken into consideration in the technical specification, provided that this concerns characteristics for which 
either a notified product certi fication body or a notified test laboratory intervene, as presented below.  
The determination of the product type report that the system house has obtained with regard to tests carried 
out by a notified body, and which is supplied to the assemblers, may be used for the regulatory marking 
purposes without the assembler having to involve again a notified body to undertake the determination of the 
product type of the essential characteristic(s) that were already tested, provided that:  
a) the assembler manufactures  a product which uses the same combination of components 
(components with the same characteristics), and in the same way, as that for which the system 
house has obtained the determination of the product type report. If this report is based on a 
combination  of components not representing the final product as to be placed on the market, 
and/or is not assembled in accordance with the system house’s instruction for assembling the 
components, the assembler needs to submit his finished product to the determinatio n of the 
product  type;  
b) the system house has notified to the manufacturer the instructions for manufacturing/assembling 
the product and installation  guidance;  
c) the assembler (manufacturer) assumes the responsibility for the correct assembly of the product 
in accordance with the instructions for manufacturing/assembling the product and installation 
guidance notified to him by the system  house;  
d) the instructions for manufacturing/assembling the product and installation guidance notified to the 
assembler (manufac turer) by the system house are an integral part of the assembler’s Factory 
Production Control system and are referred to in the determination of the product type  report;  
e) the assembler is able to provide documented evidence that the combination of component s he is  
using, and his way of manufacturing, correspond to the one for which the system house has 
obtained the determination of the product type report (he needs to keep a copy of the system 
house’s determination of the product type  report);  
f) regardless the  possibility of referring, on the basis of the agreement signed with the system 
house, to the latter’s responsibility and liability under private law, the assembler remains  
46 © UNBS  yyyy – All rights reserved  
 responsible for the product being in compliance with the declared performances, inc luding both 
the design and the manufacture of the product, which is given when he affixes the regulatory 
marking on his  product.  
6.2 Factory production control  (FPC)  
6.2.1  General  
The manufacturer shall establish, document and maintain an FPC system to ensure that t he products placed 
on the market comply with the declared performance of the essential characteristics.  
The FPC system shall consist of procedures, regular inspections and tests and/or assessments and the use of 
the results to control raw and other incomin g materials or components, equipment, the production process and 
the product.  
All the elements, requirements and provisions adopted by the manufacturer shall be documented in a 
systematic manner in the form of written policies and procedures.  
This factory production control system documentation shall ensure a common understanding of the evaluation 
of the constancy of performance and enable the achievement of the required product performances and the 
effective operation of the production control system to be  checked. Factory production control therefore brings 
together operational techniques and all measures allowing maintenance and control of the compliance of the 
product with the declared performances of the essential characteristics.  
In case the manufactur er has used shared or cascading product type results, the FPC shall also include the 
appropriate documentation as foreseen in 6.2.4 and 6.2.5.  
6.2.2  Requirements  
6.2.2.1  General  
The manufacturer is responsible for organizing the effective implementation of the FPC syste m in line with the 
content of this product standard. Tasks and responsibilities in the production control organization shall be 
documented and this documentation shall be kept up -to-date.  
The responsibility, authority and the relationship between personnel  that manages, performs or verifies work 
affecting product constancy, shall be defined. This applies in particular to personnel that need to initiate 
actions preventing product non -constancies from occurring, actions in case of non -constancies and to ident ify 
and register product constancy problems.  
Personnel performing work affecting the constancy of performance of the product shall be competent on  the 
basis  of appropriate  education,  training,  skills  and experience  for which  records  shall be maintained. In  each 
factory the manufacturer may delegate the action to a person having the necessary authority to:  
a) identify procedures to demonstrate constancy of performance of the product at appropriate  
stages;  
b) identify and record any instance of  non-constancy;  
c) ident ify procedures to correct instances of  non-constancy.  
The manufacturer shall draw up and keep up -to-date documents defining the factory production control. The 
manufacturer's documentation and procedures should be appropriate to the product and manufacturi ng 
process. The FPC system should achieve an appropriate level of confidence in the constancy of performance 
of the product. This  involves  
a)  the preparation of documented procedures and instructions relating to 
factory production control operations, in acco rdance with the requirements 
of the technical specification to which reference is made;  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  47 
 b) the effective implementation of these procedures and  instructions;  
c) the recording of these operations and their  results;  
d)  the use of these results to correct any deviati ons, repair the effects of such 
deviations, treat any resulting instances of non -conformity and, if necessary, 
revise the FPC to rectify the cause of non - constancy of  performance.  
Where subcontracting takes place, the manufacturer shall retain the overall  control of the product and ensure 
that he receives all the information that is necessary to fulfil his responsibilities according to this Uganda  
Standard.  
If the manufacturer has part of the product designed, manufactured, assembled, packed, processed and /or 
labelled by subcontracting, the FPC of the subcontractor may be taken into account, where appropriate for the 
product in question.  
The manufacturer who subcontracts all of his activities may in no circumstances pass the above 
responsibilities on to a s ubcontractor.  
NOTE  Manufacturers having an FPC system, which complies with EN ISO 9001 
standard and which addresses the provisions of the present Uganda  standard are considered 
as satisfying the FPC re quirements of the Regulation (EU) No  305/2011.  
6.2.2.2  Equipment  
6.2.2.2.1  Testing  
All weighing, measuring and testing equipment shall be calibrated and regularly inspected according to 
documented procedures, frequencies and criteria.  
6.2.2.2.2  Manufacturing  
All equipment used in the  manufacturing process shall be regularly inspected and maintained to ensure use, 
wear or failure does not cause inconsistency in the manufacturing process. Inspections and maintenance shall 
be carried out and recorded in accordance with the manufacturer’s  written procedures and the records 
retained for the period defined in the manufacturer's FPC procedures  
6.2.2.3  Raw materials and  components  
The specifications of all incoming raw materials and components shall be documented, as shall the inspection 
scheme for en suring their compliance. In case supplied kit components are used, the constancy of 
performance system of the component shall be that given in the appropriate harmonized technical 
specification for that component.  
6.2.2.4  Traceability and  marking  
Individual produc ts shall be identifiable and traceable with regard to their production origin. The manufacturer 
shall have written procedures ensuring that processes related to affixing traceability codes and/or markings 
are inspected regularly.  
6.2.2.5  Control during manufacturi ng process  
The manufacturer shall plan and carry out production under controlled conditions.  
6.2.2.6  Product testing and  evaluation  
The manufacturer shall establish procedures to ensure that the stated values of the characteristics he 
declares are maintained. The characteristics, and the means of control, are those included in Clauses 4 and 5.  
a) Self-closing: shall be subject to the tests indicated in 5.4, at least one time per  year;  
b) Self-closing and durability of self -closing: shall be subject to the tests indicated  in 5.5, at least 
one times per  year;  
c) Durability of self -closing: shall be subject to the tests indicated in 5.6, at least one time per  year.   
48 © UNBS  yyyy – All rights reserved  
 6.2.2.7  Non-complying  products  
The manufacturer shall have written procedures which specify how non -complying products sha ll be dealt 
with. Any such events shall be recorded as they occur and these records shall be kept for the period defined 
in the manufacturer’s written procedures.  
Where the product fails to satisfy the acceptance criteria, the provisions for non -complying products shall 
apply, the necessary corrective action(s) shall immediately be taken and the products or batches not 
complying shall be isolated and properly identified. Once the fault has been corrected, the test or verification 
in question shall be repeat ed. The results of controls and tests shall be properly recorded. The product 
description, date of manufacture, test method adopted, test results and acceptance criteria shall be entered in 
the records under the signature of the person responsible for the control/test.  
With regard to any control result not meeting the requirements of this Uganda  standard, the corrective 
measures taken to rectify the situation (e.g. a further test carried out, modification of manufacturing process, 
throwing away or putting r ight of product) shall be indicated in the records.  
6.2.2.8  Corrective  action  
The manufacturer shall have documented procedures that instigate action to eliminate the cause of non -
conformities in order to prevent recurrence.  
6.2.2.9  Handling, storage and  packing  
The manuf acturer shall have procedures providing methods of product handling and shall provide suitable 
storage areas preventing damage or deterioration  
6.2.3  Product specific  requirements  
The FPC system shall address this Uganda  Standard and ensure that the products pla ced on the market 
comply with the declaration of performance. The FPC system shall include a product specific FPC, which 
identifies procedures to demonstrate compliance of the product at appropriate stages, i.e.:  
a) the controls and tests to be carried out pr ior to and/or during manufacture 
according to a frequency laid down in the FPC test plan,  and/or  
b) the verifications and tests to be carried out on finished products according to 
a frequency laid down in the FPC test  plan.  
If the manufacturer uses only finis hed products, the operations under b) shall lead to an equivalent level of 
compliance of the product as if FPC had been carried out during the  production.  
If the manufacturer carries out parts of the production himself, the operations under b) may be reduc ed and 
partly replaced by operations under a). Generally, the more parts of the production that are carried out by the 
manufacturer, the more operations under b) may be replaced by operations under a). In any case the 
operation shall lead to an equivalent level of compliance of the product as if FPC had been carried out during 
the production.  
NOTE  Depending on the specific case, it can be necessary to carry out the 
operations referred to under a) and b), only the operations under a) or only those under  b). 
The operations under a) refer to the intermediate states of the product as on manufacturing machines and 
their adjustment, and measuring equipment etc. These controls and tests and their frequency shall be chosen 
based on product type and composition, the manufacturing process and its complexity, the sensitivity of 
product features to variations in manufacturing parameters etc.  
The manufacturer shall establish and maintain records that provide evidence that the production has been 
sampled and tested. These records shall show clearly whether the production has satisfied the defined 
acceptance criteria and shall be available for at least three years.  
6.2.4  Initial inspection of factory and of  FPC WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  49 
 Initial inspection of factory and of FPC shall be carried out when the  production process has been finalized 
and in operation. The factory and FPC documentation shall be assessed to verify that the requirements of 
6.3.2 and 6.3.3 are fulfilled. During the inspection it shall be verified that:  
a) all resources necessary for the achievement of the product characteristics 
included in this  Uganda  standard are in place and correctly  implemented;  
b) the FPC -procedures in accordance with the FPC documentation are followed in  practice;  
c) the product complies with the product type samples, fo r which compliance of 
the product  performance to the DoP has been  verified.  
All locations where final assembly or at least final testing of the relevant product is performed, shall be 
assessed to verify that the above conditions a) to c) are in place and i mplemented. If the FPC system covers 
more than one product, production line or production process, and it is verified that the general requirements 
are fulfilled when assessing one product, production line or production process, then the assessment of the 
general requirements does not need to be repeated when assessing the FPC for another product, production 
line or production process.  
All assessments and their results shall be documented in the initial inspection report  
6.2.5  Continuous surveillance of  FPC 
Surve illance of the FPC shall be undertaken once per year. The surveillance of the FPC shall include a review 
of the FPC test plan(s) and production processes(s) for each product to determine if any changes have been 
made since the last assessment or surveillan ce. The significance of any changes shall be assessed.  
Checks shall be made to ensure that the test plans are still correctly implemented and that the production 
equipment is still correctly maintained and calibrated at appropriate time intervals.  
The reco rds of tests and measurement made during the production process and to finished products shall be 
reviewed to ensure that the values obtained still correspond with those values for the samples submitted to 
the determination of the product type and that the  correct actions have been taken for non -compliant products.  
6.2.6  Procedure for  modifications  
If modifications are made to the product, production process or FPC system that could affect any of the 
product characteristics declared according to this standard, th en all the characteristics for which the 
manufacturer declares performance, which may be affected by the modification, shall be subject to the 
determination of the product type, as described in 6.2.1.  
Where relevant, a re -assessment of the factory and of t he FPC system shall be performed for those aspects, 
which may be affected by the modification.  
All assessments and their results shall be documented in a report.  
7 Classification  
7.1 Coding  system  
For the purpose  of this Uganda  Standard,  mechanically  opera ted locks  and latches  shall be classified  in 
accordance  with the eight  character  classification  system  described  in 7.2.1  to 7.2.8.  
Locking  plates  intended  to be sold separately  from the lock may be coded  accordingly  using  the same  
classification  system bu t with grades  only in those  categories that  are relevant  to locking  plates.  
Table  6 — Classification  
1 2 3 4 5 6 7 8  
50 © UNBS  yyyy – All rights reserved  
 Catego
ry of 
use Durabil
ity and 
force  
on latch  
bolt  Door 
mass  
and 
closing  
force  Suitability 
for use on 
fire 
resisting  
and/or 
smoke  
control  
doors  Safe
ty Corrosion  
resistanc
e and 
temperat
ure Securi
ty and 
drill  
resistan
ce Key 
identifica
tio n of 
lever  
locks  
7.2 Classification  for mechanically  operated  locks  and locking  plates  
7.2.1  Category  of use (first  digit)  
Three  grades  are identified  in accordance  with requirements  stated  in 4.2 and  Table  1. 
a) grade  1: for use by people  with a high incentive  to exercise  care and with a small  chance  of 
misuse,  e.g. residential  doors.  
b) grade  2: for use by people  with some  incentive  to exercise  care but where  there is some  
chance  of misuse,  e.g. office  doors.  
c) grade  3: for use by the public  where  there  is little incentive  to exercise  care and where  
there  is a high chance  of misuse,  e.g. doors  in public buildings.  
7.2.2  Durability  (second  digit)  
Nine grades of  durabi lity and force  F3 on latch  bolt are identified  in accordance  with 4.3 and Table  2. 
— grade  A: 50 000 test  cycles;  no force  on latch  bolt,  or for locks  without  latchbolt;  
— grade  B: 100  000  test cycles;  no force  on latch  bolt;  or for locks  without  latchbol t 
— grade  C: 200  000  test cycles;  no force  on latch  bolt;  or for locks  without  latchbolt  
— grade  L: 100  000  test cycles;  25 N force  on latch  bolt;  
— grade  M: 200  000  test cycles;  25 N force  on latch  bolt;  
— grade  R: 100  000  test cycles;  50 N force  on latch  bolt;  
— grade  S: 200  000  test cycles;  50 N force  on latch  bolt;  
— grade  W: 100  000  test cycles;  120  N force  on latch  bolt;  
— grade  X: 200  000  test cycles;  120  N force  on latch  bolt;  
The above  information  relates  to latch  action  only.  Corresponding  durability  requirements  based  on number  of 
cycles apply  to the dead  bolt and snib mechanisms.  
NOTE  For grade  C, M, S and X higher  number  of test cycles  of the latch  can be 
tested  and can be shown  in the certificate.  
7.2.3  Door  mass  and closing  force  (third digit)  
Ten grades  of door mass  and closing  force  (F9) are identified  in accordance  with 4.4. 
The following  grades  apply  for locks  with latch  function,  automatically  operated  bolts  or similar  
— grade  0: Locks  without  a latch bolt  
— grade  1: up to 100  kg door  mass;  50 N maximum  closing  force;  
— grade  2: up to 200  kg door  mass;  50 N maximum  closing  force;  
— grade  3: above  200  kg door  mass  as specified  by the WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  51 
 manufacturer;  50 N maximum  closing  force;  
— grade  4: up to 100  kg door  mass;  25 N maximum  closing  force;  
— grade  5: up to 200  kg door  mass;  25 N maximum  closing  force;  
— grade  6: above  200  kg door  mass  as specified  by the 
manufacturer;  25 N maximum  closing  force;  
— grade  7: up to 100  kg door  mass;  15 N maximum  closing  force;  
— grade  8: up to 200  kg door  mass;  15 N maximum  closing  force;  
— grade  9: above  200  kg door  mass  as specified  by the 
manufacturer;  15 N maximum  closing  force.  
7.2.4  Suitability  for use on fire resisting  and/or  smoke  control  doorset (fourth  digit)  
Four grades  are identified:  
— Grade  0: not verified  for use on fire resisting  /smoke  control  doorset  assemblies;  
— Grade A:      for use on smoke control doorset assemblies where  the lock  contributes  
to the integrity  as described  in Annex  A; 
— Grade B:        for use on smoke control and fire resisting doorset assemblie s where 
the lock contributes to the integrity as described in  Annex  A; 
— Grade N:       for use on smoke control and fire resisting doorset assemblies based on 
tests where the lock  does not contribute to keeping the door in a 
closed position during the fire resisting and/or  smoke  control  test as 
described  in Annex  A; 
7.2.5  Safety  (fifth  digit)  
Only one grade  of safety  is identified  
— Grade  0: no safety  requirement  
 
7.2.6  Corrosion  resistance  and temperature  (sixth  digit)  
Six grades  of corrosion  resistance  and temperature  requirement  are identified.  
— grade  0: no defined  corrosion  resistance;  
no temperature  requirement;  
— grade  A: low corrosion  resistance  (24 h); 
no temperature  requirement;  
— grade  C: high  corrosion  resistance  (96 h); 
no temperature  requirement;  
— grade  D: very  high  corrosion  resistance  (240  h); 
no temperature  requirement;   
52 © UNBS  yyyy – All rights reserved  
 — grade  F: high  corrosion  resistance  (96 h); 
temperature  requirement:  from –10 °C to +60 °C; 
— grade  G: very  high  corrosion  resistance  (240  h); 
temperature  requirement:  from –10 °C to +60 °C. 
7.2.7  Security  and drill resistance  (seventh  digit)  
Eight  grades  of security  and drill resistance  related  to the side of the lockcase  that is assumed  to resist  an 
attack  are identified  in Table  3. 
— grade  0: No security  requirement  
— grade  1: Minimum  securi ty and no drill  resistance;  
— grade  2: Low  security  and no drill  resistance;  
grade  3: Medium  security  and no drill resistance  
— grade  4: High  security  and no drill  resistance;  
— grade  5: High  security  with  drill  resistance;  
— grade  6: Very  high  security  and no drill resistance;  
— grade  7: Very  high  security  with  drill  resistance.  
7.2.8  Key identification  of lever  locks  (eight  digit)  
Nine grades are  identified  from 0 to H in accordance  with 4.9 and  Table  4. 
— grade  0: No requirements;  
— grade  A: Minimum  three  detaining  elements;  
— grade  B: Minimum  five detaining  elements;  
— grade  C Minimum  five detaining  elements,  extended  number  of effective  differs;  
— grade  D: Minimum  six detaining  elements;  
— grade  E: Minimum  six detaining  elements,  extended  number  of effective  differs;  
— grade  F: Minimum  seven  detaining  elements;  
— grade  G: Minimum  seven  detaining  elements,  extended  number  of effective  differs;  
— grade  H: Minimum  eight  detaining  elements,  extended  number  of effective  differs.  
NOTE  For non-lever  locks  classification  “-“ applies.  
7.3 Example  for classification  of locks,  latches  and their  locking  plates  
2 M 5 B 0 E 5 0 
This indicates a mechanically operated lock and locking plate for use in an application where people  have 
some incentive to exercise care, able to withstand a durability of 200 000 cycles with a 25 N force  on the latch 
bolt, on a door with a mass of up to 200 kg and a maximum closing force of 25 N, it also  indicates  a lock for 
use on a fire resisting/smoke  control  doorset  assembly,  without  any safety  requirement, with mode rate 
corrosion resistance in temperatures ranging from – 10 °C to + 60 °C, with  high security  and drill resistance  
and no requirements for  key identification.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  53 
 8 Marking,  labelling  and packaging  
8.1 On the product  
The following  information  shall be marked  on the lock: 
a) See ZA.3  for further  requirements  if applicable;  
b) identification  number  of the certification  body  if applicable;  
c) manufacturer's  name  or trademark  or other  means  of positive  identification;  
d) the full classification  of the system;  
month  and year of manufacture,  may be in coded  form 
8.2 On the packaging  
The following  information  shall be marked  on the packaging:  
a) manufacturer's  name  or trademark  or other  means  of positive  identification;  
b) manufacturer’s  product  reference  number.  
NOTE  See Table 7 in  8.3. 
8.3 On the installation  instruction  
The information given in Table 7 shall be marked on the installation instructions.  
Table 7 – Marking requirements  
 
Marking requirements  On the product   
On the 
packaging  On the 
installation 
instructions  Visible 
before  
installat
ion Accessible 
after 
installation  
Identification number of the 
certification body  X - - X 
Manufacturer's name or 
trademark or other means of 
positive identification   
-  
X  
X  
X 
Registered address of the 
manufacturer  - - - X 
The last two dig its of the year in 
which the marking was applied for 
the first time   
-  
-  
-  
X 
The number of the EC certificate of 
conformity  - - - X 
Reference to this Uganda  
standard. (number and year)  X
a - X
a X 
Classification in accordance with 
Clause 7 of this stan dard  X - - X 
Product information according 
with 4.1.4  - - - X 
Year of assembly by manufacturer  X - - -  
54 © UNBS  yyyy – All rights reserved  
 Manufacturer’s product reference 
number  - - X X 
a If a product conforms to different standards with different classifications, then this additional m arking may be omitted 
and included in the installation instructions. See Annex  A. 
 WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  55 
 Annex  A 
(normative)  
 
Locks and locking plates for use on fire resisting and/or smoke control 
door set  
A.1 Grade A  
Products representative of their type, being classified grade A in 7.2.4, shall have been subjected to a 
successful evaluation proving their suitability for use on smoke control doors.  
Products are for use on smoke control doors if a door incorporating the product has passed a smoke control 
test. 
The evidence and tes t application/method shall be shown in the product information  
All part of the product that are responsible for keeping the door in its closed position shall be made out of 
material with a melting point of not less than 300 °C. If the lock is equipped with  a latch bolt and the latch bolt 
could be the only part of the lock that keeps a smoke door in its closed position, then the projection of the 
latch bolt shall be at least 10 mm..  
Installation instruction shall confirm that the engagement of the latch bolt  inside the locking plate shall not be 
less than 6 mm.  
It is not necessary for the product to be operable after such a test.  
NOTE  The use of a deadbolt may prevent self -closing of the smoke control door. It is the responsibility of the national 
regulation body to decide which type of deadbolt operation is  acceptable.  
A.2 Grade B  
Products representative of their type, being classified to grade B in 7.2.4, shall have been subjected to a 
successful fire  resisting  and/or  smoke  control  doorset  test  from  both   sides to prove the effect of the 
product on the fire resistance of the complete door assembly. However if the test laboratory expert determines 
the test to be conducted from the one side of the door only (worst case situation for the product), then it 
should be allowed and stated in the test report.  
The evidence and test application/method shall be shown in the product information.  
It is not necessary for the product to be operable after such a fire resisting test.  
NOTE 1 It is the responsibility of the sp ecifiers to ensure that the fire resisting evidence for any lock covers the type of fire 
resistant door for which the lock is intended.  
NOTE 2 The use of a deadbolt may prevent self -closing of the fire resisting door. It is the responsibility of the nation al 
regulation body to decide which type of deadbolt operation is acceptable.  
A.3 Grade  N 
Products representative of their type, where other means are responsible for keeping the smoke control and 
fire resistance doorset in its closed position during the smoke control and fire resistance test, shall be 
classified grade N in 4.5  Such product shall have been subjected to a  successful smoke control and fire 
resistance test, to prove the effect of the product on the smoke control and/or fire resistance of the comple te 
door assembly.  
Testing shall be from both sides unless  the test laboratory expert decides that it is appropriate to test from the 
one side of the door only (worst case situation for the lock), in which case in it should be allowed and stated in 
the tes t report.   
56 © UNBS  yyyy – All rights reserved  
 The evidence and test application/method shall be shown in the product information.  
It is not necessary for the product to be operable after such a fire resistance test.  
NOTE 1   It is the responsibility of the specifiers to ensure that the fire resistance evidence for any lock  
covers   the type of fire resistance door for which the lock is  intended.  
NOTE 2 The use of a deadbolt may prevent self -closing of the fire resistance door. It is the 
responsibility of the national regulation body to decid e which type of deadbolt operation is acceptable.  
Table A.1 — Differences between grades A, B and N  
Requirement/ 
characteristic  Requirement 
clauses in this 
Uganda  
Standard  Grade A  Grade B  Grade N  Notes  
(expression of performance)  
Resistance to fire 
E (int egrity)  5.2.1  — Minimum 
Grade 2  Minimum 
Grade 1 
where 
applicable  Pass/fail criteria for:  
Side force on latch bolt (if any) to 
keep the door closed during fire  
5.5 — — — Minimum performance requirement 
based on fire resistance test  
Resistance to  fire 
I (insulation)  5.5 None  None  None  Pass/fail criteria for: Minimum 
performance requirement based on 
fire resistance test  
Resistance  to 
smoke  leakage  5.2.1  
5.5 Minimum 
Grade 1  — — Pass/fail criteria for:  
Side force on latch bolt (if any) to 
keep the door close d during fire  
Minimum performance requirement 
based on smoke test  
Test sampling and sequencing for locks and latches  
Each test sequence shall be conducted on one sample. One extra sample shall be provided for reference 
and substitution. If the reference l ock, latch or locking plate is used, the complete test sequence shall be 
repeated.  
Manufacturer and test laboratory shall determine the minimum number of locks from different types in 
order to cover a family.  
The samples A, B, C,..... shall follow the sequ ence 1, 2, 3 that starts with 1.  
For evaluation of essential characteristic 2 samples shall be subject to the sequence of test as shown in 
Table B.1.  
For classification of lock with its keys up to 10 samples shall be subjected to a sequence of test as show n 
in Table B.2:  
1 sample for extra test if any sequence will fail  
For classification of Locking Plate up to 5 samples shall  be subject to test as shown in Table 
B.5: 4 samples (A –D) for Static forces and Durability  
1 sample for extra test if any test fail s 
If there is more than one test performed on each sample, the test sequence shall ensure that previous 
tests do not have any influence on following tests in agreed sequence.  WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  57 
 Following tests for side force and disengaging force 6.2.1, 5.11.3.1, 5.11.3.2, 5 .11.5.1, 5.11.5.2 (column 
U/S Table B.1) shall declare which test rig used, unsupported (Figure 11  and  23)  or  supported  (Figure 
12 and  24). 
Table B.1 — Test sampling and sequencing of essential characteristic for 
locks and locking plates  
Sub clause  Test 
clause  Test  U/S
a Sequence  
  Test sample A    
4.2.1  6.2.1  Resistance to side force on latch bolt  X 1 
4.1.3  6.1.3  Return force of latch bolt   2 
4.4.2  5.7.2  Door closing force   3 
4.5 Annex A  Suitability for use in fire resistance 
and/or smoke control d oors   
4 
  Test sample B    
4.3.1  6.3.1  Durability of latch action   1 
4.7.1  6.7.1  Corrosion resistance   2 
4.1.2  6.1.3  Return force of latch bolt   3 
4.4.2  6.4.2  Door closing force   4 
Sub clause  Test clause  Test  U/Sa  Sequence  
a U/S = unsupported or supp orted test rig  
Table B.2 — Test sampling and sequencing for classification of 
locks  
 
test sample identification  
Sub 
clause  Test 
clause   
Test   
U/S
a  
A  
B  
C  
D  
E  
F  
G  
H 
4.1.3  5.4.2  Return force of latch bolt   2        
4.1.6  5.4.5  Strength of bolt act ion    1      
4.1.7  5.4.6  Minimum follower restoring torque   3        
4.2.1  5.5.1  Resistance to side force on latch 
bolt  X   2      
4.2.2  6.2.2  Torque to operate dead bolt or 
latch bolt   
4        
4.2.3  6.2.3  Strengths of follower stops      1     
4.2.4  6.2.4  Torque resistance lockable 
deadbolt operation by 
handle/knob      
2     
4.3.1  6.3.1  Durability of latch action   6        
4.3.2  6.3.2  Durability of deadbolt mechanism   (7)
b 1       
4.3.3  6.3.3  Durability of locking snib 
mechanism   8         
58 © UNBS  yyyy – All rights reserved  
 4.4.2  5.7.2 Door closing force   5        
4.7.1  5.10.1  Corrosion resistance    4       
4.7.2  5.10.2  Operation at extremes of 
temperature    2       
4.8.3  5.11.2  Torque resistance of knob of 
tubular lock    
3       
4.8.4.1  5.11.3.1  Resistance to side force on dead bolt  X     1a    
4.8.4.2  5.11.3.2  Resistance to drilling and side 
force on deadbolt  X     
1
b    
4.8.5  5.11.4  Deadbolt projection   1        
4.8.6.1  5.11.5.1  Resistance to disengaging force  X      1a   
4.8.6.2  5.11.5.2  Resistance to drilling and 
disengaging force  X      
1b   
4.8.7.1  5.11.6.1  Resistance of pulling of anti 
separation bolt         
1a  
4.8.7.2  5.11.6.2  Resistance of drilling and 
pulling of anti -separation bolt         
1b  
4.8.8.1  5.11.7.1  Resistance to forc ing of anti -lifting 
device in sliding door lock          
1a 
 
4.8.8.2   
5.11.7.2  Resistance to forcing of anti -
locking device in sliding door 
lock with drill protection           
1b 
4.8.9  5.11.8  Torque resistance of lockable 
follower     3      
 
 
test sample  identification  
Sub 
clause  Test 
clause   
Test   
U/
Sa  
A  
B  
C  
D  
E  
F  
G  
H 
  (burglar)           
4.8.10  5.11.9  Strong key attack on lever locks           
4.9.4  5.12.4  Non -interpassing of keys with just 
one interval differ   
9        
4.5 Annex 
A Suitabili ty for use in fire/smoke 
doors  Essential characteristic see Table 
B1 
a U/S = unsupported or supported test rig.  
b On Sample A in case of shared latch action instead of Sample  B. 
Table B.3 — Key test sample and sequence  
Key test sample identification   
A  
Sub  clause  Test 
clause  Test  
4.1.5  5.4.4  Strength of lever lock key  1 WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  59 
 Table B.4 — Verification of locks and key  
Locks and Key verification   
 
 
 
 
 
 
Check with reference to manufacturer’s 
documentation  Sub clause  Test clause  Test  
4.1.2  5.4.1  Dangerous subst ances  
4.1.4  5.4.3  Product information  
4.1.8  5.4.7  Protection against removal 
from door  
4.4.1  5.7 Door mass  
4.8.2  5.11.1  Locking  
4.9.1  
4.9.2  
4.9.3  
4.9.5   
 
7.2.8   
Key identification of lever 
locks  
Table B.5 — Locking plate test sample and sequenc e for classification  
Locking plate test sample identification   
A  
B  
C  
D 
Sub clause  Test clause  Test  
4.8.12  5.11.10.1  Resistance to force on box 
protected locking plate  1    
4.8.13  5.11.10.2  Resistance to side force on 
locking plate   
1   
4.8.14  5.11.10.3  Resistance to pulling of 
locking plate    
1  
4.8.15  5.11.10.4  Resistance to lifting force 
on locking plate     
1 
  
60 © UNBS  yyyy – All rights reserved  
 Bibliography  
[1] BS EN ISO 12209:2016 , Building hardware - Mechanically operated locks and locking plates - 
Requirements and test meth ods 
[2] ISO ##### -##:20##, General title — Part ##: Title of part  
 WDUS  2434: 2022  
© UNBS 2022  – All rights reserved  61 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the  UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the  relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certificati on mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
Nationa l Bureau of Standards.  
 
 WDUS 2434 : 2022    
 
ICS 77.140.6  
Price based on nn pages  
© UNBS yyyy– All rights reserved