الهيئة السعودية للمواصفات والمقاييس والجودة  
Saudi Standards, Metrology and Quality Org (SASO)  
 
  
  
  
  
 
  
  
SASO/CD  32180  (E)  
  
  
  
  
السيارات- حواجز الحماية الأمامية للشاحنات    
Motor Vehicles -Front Underrun Protective Devices  for 
Trucks  
   
   
   
   
   
   
   
   
   
 
 
 
 
 
 
 
   
   
ICS:  43.080.020  
 
THIS DOCUMENT IS A DRAFT SASO STANDARD CIRCULATED 
FOR COMMENT. IT IS, THEREFORE SUBJECT TO CHANGE AND 
MAY NOT BE REFERRED TO AS A SASO STANDARD UNTIL 
APPROVED BY THE BOARD OF DIRECTORS   SASO STANDARD  SASO  00000:2021  
  
 
  1 مقدمة 
قامت بالهيئة السعودية للمواصفات والمقاييس والجودة بإعداد مشروع المواصفة القياسية السعودية " 
السيارات - حواجز الحماية الأمامية للشاحنات   " عن طريق الفريق الفني لمركبات الطرق   بعد استعراض 
المواصفات القياسية العربية والأجنبية والدولية والمؤلفات المرجعية ذات الصلة على أن تلغي هذه المواصفة 
القياسية السعودية. SASO GSO 211 2:2011  
 
Foreword 
The Saudi Standards, Metrology and Quality Organization (SASO) has 
prepared the draft of  Saudi Standard " Motor vehicles - Front Underrun 
Protective Devices for Trucks  " by technical  committee  of road vehicle  based 
on relevant ADMO, International and National foreign Standards and 
references. These standards will be  replace SASO GSO 211 2:2011.  
  
  SASO STANDARD  SASO  00000:2021  
  
 
  2 Motor vehicles -   
Motor Vehicles - Front Underrun Protection Devices for  Truck  
  
1-  SCOPE AND FIELD OF APPLICATION  
This standard is concerned with the requirements for the front underrun protective 
devices (FUPD) of vehic les category N1 and N2 (1) .This standard does not apply to 
off road vehicles and vehicles such that their use is inco mpatible with the provisions 
of front underrun protection.  
2-  COMPLEMENTARY REFERENCES  
2.1          SASO 469  “Motor Vehicles - Weights and Dimensions”.  
2.2    SASO Technical Regulation for Front, Rear and Side Barriers for Trucks and  Trailers.   
3-  DEFINITIONS  
3.1  Maximum mass: The mass stated by the vehicle manufacturer to be technically 
permissible.  
3.2  Maximum weight: The vertical force (in newtons) required to support the same 
vehicle loaded to its maximum mass.  
3.3 Unladen Vehicle: The vehi cle in running order unoccupied and unladen but 
complete with fuel, coolant, lubricant, tools and a spare wheel.   
3.4  Type  of FUPD: means FUPD which do not differ with respect to the essential 
characteristics such as shape, dimensions, attachment, materi als and the markings  
cited for a sample of the type of RUPD as: the sample shall be clearly and indelibly 
marked on all its main components with the applicant's trade name or mark and the 
type designation.   
3.5  Front Underrun Protection (FUP) : The presen ce at the front of the vehicle of  either: 
a special FUPD or a body work, chassis parts or other components such that by 
virtue of their shape and characteristics, these elements can be regarded as fulfilling 
the function of the FUPD.   
3.6        The definitions in SASO Technical Regulation for Front, Rear and Side Barriers for 
Trucks and Trailers . 
ـــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ  
1) N2: Vehicles used for the carriage of goods and having a maximum mass exceeding 3.5 tonnes but not exceeding 12 tonnes. 
(Commercial Truck)  
    N3: Vehicles used for the carriage of goods and having a maximum mass exceeding 12 tonnes. (Commercial Truck)  SASO STANDARD  SASO  00000:2021  
  
 
  3 4-   REQUIREMENTS  
  The following shall be met:  
4.1  General  
4.1.1  All vehicles  carrying goods, including tankers, mobile cranes, mobile workshops of 
maximum mass exceeding 3.5  tonnes, shall be equipped with front underrun 
protective devices to offer effective protection for passenger cars or vehicles 
carrying goods having maximum ma ss not exceeding 3.5 tonnes against 
underrunning in the event of a frontal collision.  
4.1.2  The front underrun protective device shall comply with the requirements specified  
in item 4.4.  
4.1.3  If the vehicle is so designed and equipped at the front tha t by virtue of their shape 
and characteristics, its component parts comply with the requirements specified in 
items 4. 4 and 4. 5, then  the vehicle may not be necessary to be provided with front 
underrun protective device.  
4.1.4  The maximum mass of a vehic le type for which the front underrun protective device 
to be installed shall not exceed the value indicated on the front underrun  protective 
device for which it is designed for.   
4.1.5  Vehicles of a maximum mass not exceeding 7.5 tonnes shall comply only  with the 
ground clearance requirement of 400 mm set out in this standard .  
4.2 Material  
4.2.1 The mechanical properties of the underrun protective device's material shall be 
either hot rolled high strength  Steel with a minimum yield strength of 350 N/mm2 
and minimum tensile strength of 480 N/mm2 or high strength Aluminum Alloy with 
a minimum yield strength of 350 N/mm2 and minimum tensile strength of 480 
N/mm2. 
4.2.2 The minimum mechanical properties of bolts should be made of Low-carbon  
martensite with 1 0.9 class  bolt with minimum proof strength of 830 N/mm2, 
minimum yield strength of 940 N/mm2 and minimum tensile strength of 1040  
N/mm2.  
4.3 Welding  
4.3.1  Welding could only use between the UPD and the bridge/support. It is strictly 
prohibited to weld the  UPD or the bridge/support to the chassis of the truck or trailer.  SASO STANDARD  SASO  00000:2021  
  
 
  4 4.3.2  Welding should be fully welded  (see Figure  1). 
4.3.3  Welding thickness (h) should be compatible between the bridge/support and the UPD  
(Figure  2). 
4.3.4  The minimum requirements  for the welder wire's material used in welding is AWS 
electrode number (E90xx), with minimum yield strength of 531 N/mm2 and minimum 
tensile strength of 620 N/mm2. 
4.4 FUPD Technical requirement      
4.4.1  The FUPD shall offer adequate resistance to force s applied parallel to the 
longitudinal axis of the vehicle and also satisfy certain dimensional requirements. 
These shall be checked in accordance  with dimensions and Material specified in 
this standard.   
4.4.2  The section height of the FUPD cross -member shall not be less than 100 mm for 
goods vehicles having a maximum mass between 3.5 and 12 tonnes  and 120 mm 
for goods vehicles having maximum mass exceeding 12  tones  (see Figure  3). 
4.4.3  The lateral extremities of the cross -member shall not bend to the front or have a 
sharp outer edge; this condition is fulfilled when the lateral extremities of the cross -
member are rounded on the outside and have a radius of curvature of not less than 
2.5 mm.  
4.4.4  The device may be so designed that its position at the front of the vehicle can be 
varied. In this event, there shall be a guaranteed method of securing it in the service 
position so that any unintentional change of position is precluded.   
4.4.5  It shall be possible for the operator to vary the position of the device by applying a 
force not exceeding 40 daN  (400 N) ;  
4.4.6  The outermost surfaces of every front guard installation shall be essentially smooth 
or horizontally corrugated so that d omed heads of bolts or rivets may protrude 
beyond the surface to a distance not exceeding 10 mm.  
4.5  Installation of FUPD    
4.5.1  The maximum mass of a vehicle type shall not exceed the value indicated on the 
approved FUPD intended to be installed on that vehicle.  
4.5.2  The vehicle with the FUPD installed shall satisfy the dimensional requirements 
specified in item 6. 4.   SASO STANDARD  SASO  00000:2021  
  
 
  5 4.5.3  In measuring the distances, any part of the vehicle which is more than 2m above the 
ground shall be excluded.  
4.5.4  The maximum ground clearance with respect to the underside of the FUPD shall be 
no more than 400 mm, between the two points (P 1) in the in stalled condition.  
4.5.5  Outboard of each point (P 1) of the above -mentioned height may be greater than 
400mm providing the underside is not above a plane passing through the underside 
of the FUPD directly below the point (P 1) and forming a slope at 15° a bove the 
horizontal ( Figure  5). 
4.5.6  The width of the FUPD shall at no point exceed the width of the mudguards 
covering the wheels of the foremost axle nor shall it be more than 100 mm shorter 
on either side than the foremost axle measured at the outermo st points  of the tyres, 
excluding the bulging of the tyres close to the ground ( Figure  4), or 200 mm shorter 
on either side, measured from the outermost points of the access steps to the driver's 
cabin.  
5-  MARKING  
5.1   The marking shall be comply with S ASO technical regulation for  Technical 
regulation for front, rear and Lateral Underrun Protective Devices for Trucks and 
Trailers . 
6-  DIMENSION SPECIFICATION S 
6.1 Measuring instruments  
6.1.1  Dimension measuring instrument   
  The instruments used shall permit measurement to an accuracy of ( ±1) mm.  
6.2 Approval Dimension s Specifications  
 The dimensions  specifications design for front underrun protective devices  shall be 
followed  at Annex 1.  
7-  CRITERIA OF TECHNICAL CONFORMITY  
7.1  The front underrun protective device shall be considered complying with all the 
requirements of this standard when the withdrawn sample from the consignment or 
the supplied sample by the manufacturer, otherwise the front underrun protective 
device shall be considered noncomp lying   
 SASO STANDARD  SASO  00000:2021  
  
 
  6  
 
 
 
Knowing that (h) means welding thickness.  
 
Figure  1: Approved welding shape  
 
SASO STANDARD  SASO  00000:2021  
  
 
  7  
 
Figure  2: Correct methods followed in welding  
 
 
 
Figure  3: Front view of two trucks having different weights with a view of the FUPD  
 
SASO STANDARD  SASO  00000:2021  
  
 
  8              
FUP Normally Consists of a Cross -Member and Links to the Chassis or Other Structural Members  
Note: The Shape of FUPD is only an example  
Figure  4: Top view of truck front part  
 
 
 
Figure  5: maximum ground clearance and forming a slope at 15° above the horizontal  
SASO STANDARD  SASO  00000:2021  
  
 
  9 Annex 1 
Approval Dimension s and materials  Specifications  
1. The following Dimension s and materials  specifications design for front underrun 
protective devices shall be followed in case of failing to do inspection test.  
1.1  Visual inspection   
  The front underrun protective device shall be visually examined to check for exact 
dimensions, bolts type, welding standard, any damage, crack, sharp outer edge, and 
any apparent defects.  
1.2 The mechanical properties of the underrun protective device's m aterial shall be as 
follows:  
 
 
 
1.3 General Dimensions of FUPD  
1.3.1 Main models for the cross -sectional area of FUPD as in Figure  6. 
 
Figure  6: Main models for cross -sectional area of the front barrier.  
1.3.2 Dimensions of the cross -sectional area  
Table 1: Trucks with a maximum weight between 3.5 to 12 tones.  
 
 
 
 
 
Material Used  Type  Min. Yield 
Strength  Min. Tensile 
Strength  
Steel  Hot Rolled  350 N/mm2 480 N/mm2 
Aluminum Alloy  (Al-Cu Alloy)  350 N/mm2 480 N/mm2 
Type of cross -
sectional area  minimum  
D (mm)  B (mm)  C (mm)  minimum  
t (mm)  
C- Section  100 50 20 5 
Rectangle section  100 50 ----- 5 SASO STANDARD  SASO  00000:2021  
  
 
  10 Table 2: Trucks exceeding weight 12 tones.  
 
 
 
 
1.3.3  Different Main Models of FUPDs  
The underrun protective device consists of front underrun protective device and 
the carrier bridge that connects the front underrun protective device to the truck 
chassis as in Figure  7. 
 
Figure  7: A model of FUPD and its carrier bridge  
 
1.3.3.1  Front Underrun Protective Device (FUPD)  
 
Figure  8: General model of truck FUPD  
Type of cross -
sectional area  minimum  
D (mm)  B (mm)  C (mm)  minimum  
t (mm)  
C- Section  120 60 20 5 
Rectangle section  120 60 ----- 5 SASO STANDARD  SASO  00000:2021  
  
 
  11 - Location at where the place of FUPDs attached to the carrier bridges  
 
    Figure  9: Front view illustrating the place of FUPD is fitted to the carrier bridge  
 
Table 3: Adding support between bridge and FUPD  
 
1.3.3.2  Carrier Bridge Connecting FUPD to Truck Chassis  
- When the truck has a chassis of (I -section beam), this type of carrier bridge is 
used.  
 
Figure  10: Model of carrier bridge used with (I -section beam) truck chassis  
- When the truck has a chassis of (C -section beam), these types of the carrier 
bridge is used.  
 
       Figure  11: Models of carrier bridge used with (C -section beam) truck chassis  
Type of Material  L (mm)  W (mm)  
Optional to add a support 
between bridge and FUPD  W (mm)  
Must add a support between 
bridge and FUPD  
Steel  700-1200  Less or equal to 400mm  The distance is over 400mm  
Aluminum Alloy  700-1200  Less or equal to 400mm  The distance is over 400mm  
 
 
 
 SASO STANDARD  SASO  00000:2021  
  
 
  12 1.3.3.3  Adding Support to Carrier Bridge between FUPD and Truck Chassis  
- If the distance (W) after fixing the carrier bridge on the FUPD exceeds 400mm, 
a rear support shall be installed as shown in Figure . 12. 
 
Figure  12: Support must be added between FUPD and carrier bridge when distance (W) 
exceeds 400 mm  
 
 
1.3.3.4  Connecting FUPD Parts  
- Connection can be done by welding or using bolts, as clarified in item 4.2. For 
bolts, they shall be as shown in Table 4.  
 
Table 4: recommendation of minimum number of bolts and diameter used for trucks 
 
 
 
 
 
 
 
   
 
 
   
Trucks with a maximum weight between 
3.5 to 12 tones  Trucks exceeding weight 12 tones  
Number of Bolts  Bolts Diameter (mm)  Number of Bolts  Bolts Diameter (mm)  
4 16 4 18 
5 14 5 16 
6 13 6 15 
7 12 7 14 
8 11 8 13 
9 10 9 12 
SASO STANDARD  SASO  00000:2021  
  
 
  13 1.3.3.5  Sample of FUPDs Models      
Figure  13: Models of truck FUPDs  
 
1.3.3.6  For further details, see (Annex 2 and 3 ). 
 
    
  
SASO STANDARD  SASO  00000:2021  
  
 
  14 Annex 2 
Sample Models of FUPDs in Truck  
 
SASO STANDARD  SASO  00000:2021  
  
 
  15  
  
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  16  
  
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  17  
  
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  18  
  
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  19  
Annex 3 
Models of Carrier Bridges and Supporters used in Connecting UPD to Chassis  
  
SASO STANDARD  SASO  00000:2021  
  
 
  20  
 
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  21   
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  22  
  
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  23   
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  24