This translation is provisional translation for reference, formally refer to the original text.

ORDINANCEFORTECHNICAL SPECIFICATIONS PERTAINING
TO SNAP OR SCREW TYPE METAL
COUPLINGS USED FOR FIRE HOSES AND
SCREW TYPE METAL COUPLINGS USEDFOR FIRE SUCTION HOSES(Ordinance of the Ministry of Internal Affairs
and Communications No. 23 of March 27, 2013)

In accordance with the provision of Article 21-16-3 paragraph (1) of the Fire Service Act (Act No.
186 of 1948), the Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal
Couplings Used for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses
shall be provided as follows.
CONTENTS

CHAPTER 1

GENERAL PROVISIONS (Article 1 ~ 2)............................................................... 3

CHAPTER 2

METAL COUPLINGS FOR FIRE DEFENSE (Article 3 ~ 20) ............................. 4

CHAPTER 3

SNAP TYPE METAL COUPLINGS FOR LARGE VOLUME FOAM
TURRET (Article 21 and 22) ................................................................................. 10

CHAPTER 4

TWIST TYPE METAL COUPLINGS FOR LARGE VOLUME FOAM
TURRET (Article 23 ~ 27) ...................................................................................... 10

CHAPTER 5

MISCELLANEOUS PROVISIONS (Article 28).................................................. 12

SUPPLEMENTARY PROVISIONS .................................................................................................. 12

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 1~2)

CHAPTER 1 GENERAL PROVISIONS(Purport)
Article 1
This Ordinance shall cover the technical specifications applicable to snap orscrew type metal couplings used for fire hoses and screw type metal couplings used for firesuction hoses.
(Definitions)
Article 2
In this Ordinance, the meanings of the terms listed in the following shall be as
specified respectively in these items.
(i)
Metal couplings for fire defense: Metal fittings to be mounted at the ends of hoses orsuction hoses to couple fire hoses [meaning the hoses prescribed in Article 2 item (i) of
the Ordinance for Technical Specifications Pertaining to Fire Hoses (Ordinance of the
Ministry of Internal Affairs and Communications No. 22 of 2013; hereinafter referred toas “the Hose Specifications Ordinance”); hereinafter referred to as “hose(s)”] or fire suction hoses [meaning those prescribed in Article 2 item (i) of the Ordinance for Technical
Specifications Pertaining to Fire Suction Hoses (Ordinance of the Ministry of Home Affairs No. 25 of 1986; hereinafter referred to as “the Suction Hose Specifications Ordinance”); hereinafter referred to as “suction hose(s)”] with other hoses, suction hoses,
power fire pumps [meaning those prescribed in Article 2 item (i) of the Ordinance ofthe Ministry of Home Affairs No. 24 of 1986; hereinafter referred to as “the Power
Pump Specifications Ordinance”], etc.
(ii)
Coupling section: A section where metal couplings for fire defense are to be engaged
with each other(iii)
Fixing section: A section where a hose or suction hose is to be fitted(iv)
Snap type metal couplings: Metal couplings using the insertion method for coupling(v)
Screw type metal couplings: Metal couplings using screws for coupling(vi)
Snap type metal couplings for large volume foam turret: Among snap type metal couplings, those to be fixed at the ends of large volume hoses to couple hoses for large volume foam turret (meaning those prescribed in Article 2 item (iv) of the Hose Specifications Ordinance; hereinafter referred to as “large volume hose(s)”) which are only used
for the intended purpose of disaster prevention equipment for large volume foam turret [meaning the equipment prescribed in Article 13 paragraph (3) of the Ministerial
Ordinance for Enforcement of the Act on the Prevention of Disasters at Petroleum Industrial Complexes and Other Petroleum Facilities (Cabinet Order No. 129 of 1976); thesame shall apply in the following item], with other large volume hoses, automotive fireappliances for large volume foam turret [meaning those prescribed in Article 2 item (iv)of the Power Pump Specifications Ordinance; the same shall apply in the followingitem] or portable fire pumps for large volume foam turret [meaning those prescribed in
Article 2 item (v) of the Power Pump Specifications Ordinance; the same shall apply inthe following item], etc. by the insertion method.
(vii)
Twist type metal couplings for large volume foam turret: Among screw type metal couplings, those to be fixed at the ends of large volume hoses or large volume suction hoses [meaning those prescribed in Article 2 item (ii) of the Suction Hose Specifications
Ordinance; hereinafter referred to as “large volume suction hose(s)] which are onlyused for the intended purpose of disaster prevention equipment for large volume foamturret to couple large volume hoses or large volume suction hoses with other large volume hoses or large volume suction hoses, automotive pump appliances for large volume foam turret or portable fire pumps for large volume foam turret, etc. by the twisting method.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 2~5)(viii)(ix)

Nominal bore: Design inside diameter (Unit: mm) of the coupling section of snap type
metal couplings for large volume foam turret or twist type metal couplings for large
volume foam turret
Working pressure: Design normal maximum working water pressure (Unit: MPa)

CHAPTER 2 METAL COUPLINGS FOR FIRE DEFENSE(Classification)
Article 3
The metal couplings for fire defense (excluding snap type metal couplings forlarge volume foam turret and twist type metal couplings for large volume foam turret; thesame shall apply in the rest of this chapter) shall be classified as shown in the following table.
Engagement
SectionSnap Type
Screw Type

Intended Purpose
For Fire HoseFor Fire HoseFor Fire Suction Hose

Nominal Diameter Class
150
150

140

125
125

115

100
100

90
90

75
75
75

65
65
65

50
50
50

40
40
40

30
30

25
25
25

20

(General Structure)
Article 4
The structure of the metal couplings for fire defense shall be as specified in thefollowing.
(i)
Structure with little friction loss by water flow(ii)
Use of uniform and good quality materials(iii)
The fixing section shall be strong and have a structure whereby a fixed hose or suction
hose is difficult to uncouple.
(iv)
Any portion which may be touched by a person shall be provided with the necessary
measures, such as chamfering or the removal of burrs, etc., to prevent any hazard.
(v)
There shall be no auxiliary devices which may damage the functions of the metal couplings.
(vi)
Any portion where different metals are in contact with each other shall be provided
with the necessary measures to prevent corrosion.
(Materials)
Article 5
The materials used for components or portions of metal couplings for fire defense which are listed in the left-hand column of the following table shall be those listed in
the right-hand column of the said table or shall have strength in terms of tensile strengthand elongation equivalent to or higher than those of the material(s) listed in the right-handcolumn of the said table in the case where the No. 4 specimen (No. 5 specimen for claw
springs) sampled by the method specified by Japan Industrial Standards (hereinafter referred to as “JIS”) Z2201 as specified in Article 17 paragraph (1) of the Industrial Standardization Act (Act No. 185 of 1949) is used to conduct the test in JIS Z2241.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 5~6)
Component or Portion
InsertBracketPush Ring
Clamping Ring
Fixing Section
Claw
Claw Spring

Component to Prevent the Loosening ofClamping Ring

Material
JIS H4080: Aluminium and aluminium alloys -- extruded tubes and cold-drawn tubes
JIS H4100: Aluminium and aluminium alloy -- extruded shape
JIS H5120: Copper and copper alloy castings – bronze castings and silzin bronze castings
JIS H5121: Copper alloy continuous castings – bronze continuous castings and silzin
bronze continuous castings
JIS H5202: Aluminum alloy castings
JIS H5120: Copper and copper alloy castings – bronze castings
JIS H5121: Copper alloy continuous castings – bronze continuous castings
JIS G4313: Cold rolled stainless steel strip for springs
JIS G4314: Stainless steel wires for springs
JIS H3110: Phosphor bronze and nickel silver sheets, plates and strips
JIS H 3130: Copper beryllium alloy, copper titanium alloy, phosphor bronze, coppernickel-tin alloy and nickel silver sheets, plates and strips for springs
JIS G4308: Stainless steel wire rods
JIS H3260: Copper and copper alloy wires
JIS H4080: Aluminium and aluminium alloys extruded tubes and cold-drawn tubes
JIS H5120: Copper and copper alloy castings – bronze castings
JIS H5121: Copper alloy continuous castings – bronze continuous castings(2) With regard to the material of the packing used for metal couplings for fire defense, the value measured by the measuring method listed in the middle column of the following table incorrespondence with the item listed in the left-hand column of the said table shall be within
the range listed in the right-hand column of the said table or shall indicate a level of performance equivalent to or higher than what is indicated by the said value. In this case, the test
temperature and test duration regarding the oil resistance and aging resistance shall be
100°C and 70 hours respectively.

Tensile Strength (Unit: MPa)
Elongation (Unit: %)Measuring
MethodJIS K6251
JIS K6251

Hardness

JIS K6253

Item

Oil
Resistance

Volume-Change Modulus(Unit: %)Aging
Resistance

Percentage Change of Tensile Strength (Unit: %)Percentage Change ofElongation (Unit: %)Change of Hardness

Range

JIS 6258
No.3 OilJIS K6258
No.1 OilJIS K6257≧10≧500 (snap type metal couplings)≧100 (screw type metal couplings)
35≦ Hardness ≦45 (snap type metal couplings)
75≦ Hardness ≦85 (screw type metal couplings)+50 ≦ % Change ≦ +120 (snap type metal couplings)+20 ≦ % Change ≦ +80 (screw type metal couplings)-10 ≦ % Change ≦ +15 (snap type metal couplings)-5 ≦ % Change ≦ +10 (screw type metal couplings)≧ -15

JIS K6257≧ -40

JIS K6257+15(Indications)
Article 6
The information specified in the following items shall be indicated on all metal
couplings for fire defense in an easily visible place in such a manner that the subject information is not easily erased.
(i)Name or trademark of the manufacturer(ii)Year of manufacture(iii)
Nominal diameter class of individual metal couplings for fire defense(iv)
Word “suction” for metal couplings for fire defense for fire suction hoses(v)
Nominal diameter class of the hose or suction hose to which a metal coupling for fireOrdinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 6~8)(vi)

defense is to be fixed in the case of a metal coupling for fire defense to which a hose or
suction hose of a different nominal diameter class from the nominal diameter class ofthe said metal coupling for fire defense is to be fixed.
Working pressure(Structure of Snap Type Spigot)
Article 7
The structure of a snap type spigot (meaning a snap type metal coupling composed of an insert, push ring, etc.; the same shall apply hereinafter) shall be as specified in
the following in addition to conforming to each item of Article 4.
(i)
The dimensions of each portion shall be as specified in Appended Table 1 in correspondence with the relevant nominal diameter class.
(ii)
The structure shall allow easy coupling and uncoupling with a snap type socket.
(iii)
The structure shall not prevent the detachment of the push ring in the state where ahose is not fixed.
(iv)
The push ring shall be sufficiently strong and shall not suffer from any deformation,etc. as a result of uncoupling from a snap type socket.
(Structure of Snap Type Socket)
Article 8
The structure of a snap type socket (meaning a snap type metal coupling composed of a bracket, claw, claw spring, packing, etc.; the same shall apply hereinafter) shall be
as specified in the following in addition to conforming to each item of Article 4.
(i)
The dimensions of each portion shall be as specified in Appended Table 2 in correspondence with the relevant nominal diameter class.
(ii)
The structure shall allow easy coupling and decoupling with a snap type spigot.
(iii)
The claw chamber shall have a structure to prevent the easy incursion of sand and otherforeign matters.
(iv)
The number of claws shall be three or more.
(v)
The claws shall be positioned at even intervals.
(vi)
The claws shall have the same shape.
(vii)
The total of the buckling strength of a claw (meaning the load required to make the center of the claw to which downward force is applied reach the top face F specified inAppended Table 2; the same shall apply in the following item) shall be the strength
specified in the following table in correspondence with the nominal diameter class.
Nominal Diameter Class
75
65
50
40
30
25

(viii)
(ix)
(x)
(xi)

Strength (Unit: newtons)
90
75
60
45
35
30

The difference between the buckling strength of individual claws and their averagevalue shall be within 20% of the average value.
The structure shall be such that in the case of coupling with a snap type spigot, the tipsof all the claws shall be in contact with the snap type spigot with some pressure.
The structure shall be such that the packing can be easily replaced.
The packing shall not easily fall off.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 9~11)(Structure of Screw Type Spigot)
Article 9
The structure of a screw type spigot (meaning a screw type metal coupling composed of an insert, etc.; the same shall apply hereinafter) shall be as specified in the following in addition to conforming to each item of Article 4.
(i)
The dimensions of each portion shall be as specified in Appended Table 3, Appended Table 4 and Appended Table 5 in correspondence with the relevant nominal diameter class.
(ii)
The structure shall allow easy coupling and uncoupling with a screw type socket.
(iii)
In the case of a screw type spigot which uses a tool for coupling and uncoupling with ascrew type socket, the structure shall allow the easy use of the tool as well as coupling
and uncoupling without fail.
(iv)
In the case of a screw type spigot which has a protrusion for coupling and uncouplingwith a screw type socket, the material of such protrusion shall have a strength equivalent to or higher than that of an insert.
(v)
The threading start portion of a screw shall have any incomplete screw portion removed. In this case, the height of the cross-section after such removal shall be one-thirdor less of the thread height.
(Structure of Screw Type Socket)
Article 10
The structure of a screw type socket (meaning a screw type metal coupling composed of a clamping ring, bracket, packing, etc.; the same shall apply hereinafter) shall be as
specified in the following in addition to conforming to each item of Article 4.
(i)
The dimensions of each portion shall be as specified in Appended Table 4, Appended Table 5 and Appended Table 6 in correspondence with the relevant nominal diameter class.
(ii)
The structure shall allow easy coupling and uncoupling with a screw type spigot.
(iii)
In the case of a screw type socket which uses a tool for coupling and uncoupling with ascrew type spigot, the structure shall allow easy use of the tool as well as coupling anduncoupling without fail.
(iv)
In the case of a screw type socket which has a protrusion for coupling and uncouplingwith a screw type spigot, the material of such protrusion shall have a strength equivalent to or higher than that of a clamping ring.
(v)
The structure shall be such that the clamping ring does not fall off.
(vi)
The clamping ring shall be able to freely rotate.
(vii)
The threading start portion of a clamping ring shall have any incomplete screw portion
removed. In this case, the height of the cross-section after such removal shall be onethird or less of the thread height.
(viii) The structure shall be such that the packing can be easily replaced.
(ix)
The packing shall not easily fall off.
(x)
The portion to prevent loosening of the clamping ring shall have a structure which prevents the easy disassembly of the relevant component.
(Coupling and Uncoupling Force)
Article 11
With regard to snap type metal couplings, the force required to couple a socketwith a spigot or a spigot with a socket (meaning the load at the time when snap type couplings are completely coupled in the case where force is applied to the spigot in the directionof the coupling after the spigot is in contact with the socket) and the force required for uncoupling (meaning the load at the time when the claws reach the Column J value of the pushring specified in Appended Table 1 in the case where force is applied to the push ring of
coupled snap type metal couplings in the direction of uncoupling) shall be equal to or lessthan the force specified in the following table in correspondence with the relevant nominal
diameter class.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 11~14)
Nominal Diameter Class
75
65
50
40
30
25

Force (Unit: newtons)
150
135
105
90
85
75

(Pressure Test)
Article 12
Metal couplings for fire defense shall neither suffer from any cracks, conspicuous deformation, water leakage, etc. nor uncouple from the coupling section in the casewhere internal pressure equivalent to double the working pressure is applied for 5 minutes
in the state of the said metal couplings for fire defense being coupled.
(2) Metal couplings for fire defense to be used with hoses shall neither suffer from water leakage from the fixing section nor experience the detachment of a fixed hose in the case whereinternal pressure equivalent to double the working pressure is applied for 5 minutes in thestate of the said metal couplings for fire defense being coupled with each other and eachcoupling fixed with a hose.
(3) Metal couplings for fire defense to be used with suction hoses shall neither suffer from waterleakage from the fixing section nor experience the detachment of a fixed suction hose in thecase where internal pressure equivalent to double the working pressure is applied for 5
minutes in the state of the said metal couplings for fire defense being coupled with each other and each coupling being fixed with a suction hose.
(Water Leakage Test)
Article 13
Metal couplings for fire defense to be used with hoses shall not suffer from water leakage from the coupling section in the case where a given internal pressure not exceeding the working pressure is applied in the state of the said metal couplings for fire defense
being coupled with each other.
(Negative Pressure Test)
Article 14
Metal couplings for fire defense to be used with suction hoses shall conform toeach of the following items in the case where they are left standing for 10 minutes with theinternal degree of vacuum being the value obtained by the following equation or higher inthe state of the said metal couplings for fire defense being coupled with each other.
Degree of vacuum (kPa) = atmospheric pressure in the test environment (kPa) ÷ standard
atmospheric pressure (kPa) x 94 kPa(i)
Neither any cracks nor conspicuous deformation shall occur.
(ii)
The leakage after 30 seconds shall not exceed the degree of vacuum of 1.33 kPa.
(iii)
Coupling and uncoupling shall be easily conducted.
(2) Metal couplings for fire defense to be used with suction hoses shall not experience leakage
equivalent to the degree of vacuum of 1.33 kPa or more from the coupling section after 30
seconds in the case where they are left standing for 10 minutes with the internal degree of
vacuum being equal to or higher than the degree of vacuum obtained by the equation in thepreceding paragraph in the state of the said metal couplings for fire defense being coupledwith each other and each being fixed with a suction hose of which the ends are blocked.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 15~19)(Repetition Test)
Article 15
Snap type metal couplings shall conform to each of the following items after therepetition of coupling and uncoupling for 1,000 times.
(i)
Neither any cracks nor conspicuous deformation shall occur.
(ii)
Coupling and uncoupling shall be easily conducted.
(iii)
In the case of snap type metal couplings with an anti-corrosion covering, the anticorrosion covering at the coupling section shall not peel off.
(Drop Test)
Article 16
Metal couplings for fire defense to be used with hoses shall not suffer detachment from the coupling section, cracks or conspicuous deformation and shall allow easy
coupling and uncoupling in the case where each coupling is fixed with a 1 m long hose in
the state of the said metal couplings for fire defense being coupled with each other anddropped freely from a position of 1 m in height with the coupling direction of the said metal
couplings being horizontal on to a flat concrete surface.
(2) Metal couplings for fire defense to be used with suction hoses shall not suffer detachmentfrom the coupling section, cracks or conspicuous deformation and shall allow easy coupling
and uncoupling in the case where each coupling is fixed with a suction hose in the state of
the said metal couplings for fire defense being coupled with each other and dropped freely
from a position of 70 cm in height with the coupling direction of the said metal couplings being horizontal on to a flat concrete surface.
(Dragging Test)
Article 17
Metal couplings for fire defense to be used with hoses shall not suffer detachment, cracks or conspicuous deformation and shall allow easy coupling and uncoupling in
the case where each coupling is fixed with a hose in the state of the said metal couplings forfire defense being coupled with each other and the hoses being dragged by the ends (theends which are not coupled) on a flat concrete surface for 20 m in the direction of coupling at
a speed of not more than 10 km/hour with the said metal couplings for fire defense being incontact with the concrete surface.
(Bending Test)
Article 18
Snap type metal couplings shall not suffer detachment from the coupling section, cracks or conspicuous deformation and shall allow easy coupling and uncoupling in
the case where one of the couplings is fixed in the state of the said snap type metal couplings
being coupled with each other and internal pressure equivalent to the working pressure isapplied and force is applied perpendicular to the insertion direction for 30 seconds so thatthe bending moment obtained by the following equation is generated at the coupling section.
Bending moment (newtons.mm) = 300 N x 1.5 x (nominal diameter class x 15) mm(Corrosion Test)
Article 19
Metal couplings for fire defense shall not suffer any corrosion which may impede their functions in the case where they have undergone a cycle of exposure to salt water(water solution with 5 % salt by mass) spray for eight hours and standing still for 16 hours as
specified by JIS Z2371 (Methods of salt spray testing) 5 times followed by water cleaning andstanding still for 24 hours for natural drying.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 20~24)(Squashing Test for Fixing Section)
Article 20
Metal couplings for fire defense to be used with fire hoses shall not suffer detachment from the coupling section, cracks or conspicuous deformation and shall allow easy
coupling and uncoupling in the case where a load of 1,000 newtons is applied perpendicular
to the insertion direction for 5 minutes to a portion of 1 cm in width from the end of the fixing section in the state of the said metal couplings for fire defense being coupled with eachother.

CHAPTER 3 SNAP TYPE METAL COUPLINGS FOR LARGE VOLUME FOAM
TURRET(Indications)
Article 21
The information specified in the following items shall be indicated on all metal
couplings for large volume foam turret in such a manner that the subject information is noteasily erased.
(i)Name or trademark of the manufacturer(ii)Year of manufacture(iii)
Nominal bore(iv)
Nominal bore [meaning the nominal bore prescribed in Article 4 paragraph (2) of the
Hose Specifications Ordinance] of a large volume hose to be fixed(v)
Working pressure(vi)
Indication that it is a metal coupling for large volume foam turret(vii)
Indication that it is to be fixed only to a large volume hose which has been treated toprevent deterioration of the jacket [meaning the jacket prescribed in Article 2 item (viii)of the Hose Specifications Ordinance; the same shall apply in Article 26 item (viii)] of alarge volume hose
(Application Mutatis Mutandis)
Article 22
The provisions of Article 4, Article 5, Article 7 [excluding item (i)], Article 8 [excluding item (i) and item (vii)], article 12 paragraph (1) and paragraph (2), Article 13, Article
15, Article 16 paragraph (1) and Article 17 through Article 20 shall apply mutatis mutandis tosnap type metal couplings for large volume foam turret. In this case, the word “double” inArticle 12 paragraph (1) and paragraph (2) shall be deemed to be replaced by “double [1.5times for those giving the indication in Article 21 item (vii)]”, the phrase “1,000 times” in Article 15 shall be deemed to be replaced by “100 times” and the phrase “nominal diameterclass” in Article 18 shall be deemed to be replaced by “nominal bore”.

CHAPTER 4 TWIST TYPE METAL COUPLINGS FOR LARGE VOLUME FOAM
TURRET(Classification)
Article 23
Twist type metal couplings for large volume foam turret shall be classified intoeither those for large volume hoses or those for large volume suction hoses depending on
their intended purpose.
(Structure)
Article 24
The structure of twist type metal couplings for large volume foam turret shall be
as specified in the following in addition to conforming to each item of Article 4.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses (Article 24~27)
(i)
(ii)
(iii)
(iv)

(v)

The structure shall allow easy replacement of the packing.
The packing shall not easily fall off.
The coupling section shall allow easy coupling and uncoupling.
The coupling section shall have a structure to prevent the easy incursion of sand andother foreign matters; provided, however, that this shall not apply to a coupling section
which has a special structure which does not require the prevention of such incursion.
The coupling section shall be sufficiently strong and shall not suffer from any deformation, etc. due to coupling and uncoupling maneuvers.

(Materials)
Article 25
The materials used for the principal components and portions of twist type metal couplings for large volume foam turret shall conform to one of the following items.
(i)
JIS H4080: Aluminium and aluminium alloys --- extruded tubes and cold-drawn tubes(ii)
JIS H4100: Aluminium and aluminium alloys --- extruded shape(iii)
JIS H5120: Copper and copper alloy castings --- bronze castings and silzin bronze castings(iv)
JIS H5121: Copper alloy continuous castings --- bronze continuous castings and silzin
bronze continuous castings(v)
JIS H5202: Aluminium alloy castings(vi)
JIS H3260: Copper and copper alloy wires(vii)
The tensile strength and elongation shall be equivalent to or higher than those listed initem (i) through item (vi) in the case where the test using the No. 4 specimen sampled
in the manner specified in JIS Z2201 is conducted as specified in JIS Z2241.
(2) In the case where a packing is used for a twist type metal coupling for large volume foamturret, the provision of Article 5 paragraph (2) shall apply mutatis mutandis to the material of
the said packing.
(Indications)
Article 26
The information specified in the following items shall be indicated on all twist
type metal couplings for large volume foam turret in such a manner that the subject information is not easily erased.
(i)Name or trademark of the manufacturer(ii)Year of manufacture(iii)
Nominal bore(iv)
Nominal bore [meaning the nominal bore prescribed in Article 4 paragraph (2) of the
Hose Specifications Ordinance or Article 2 item (iii) of the Suction Hose Specifications
Ordinance] of a large volume hose or large volume suction hose to be fixed(v)
Working pressure(vi)
Word “suction” for those to be used with large volume suction hoses(vii)
Indication that it is a twist type metal coupling for large volume foam turret(viii) Indication that it is to be fixed only to a large volume hose which has been treated toprevent deterioration of the jacket of a large volume hose
(Application Mutatis Mutandis)
Article 27
The provisions of Article 12 through Article 20 shall apply mutatis mutandis to
twist type metal couplings for large volume foam turret. In this case, the word “double” inArticle 12 paragraph (1) and paragraph (2) shall be deemed to be replaced by “double [1.5times for those giving the indication in Article 26 item (viii)]”, the phrase “1,000 times” in
Article 15 shall be deemed to be replaced by “100 times” and the phrase “nominal diameterclass” in Article 18 shall be deemed to be replaced by “nominal bore”.

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses(Article 28~ Supplementary Provisions)

CHAPTER 5 MISCELLANEOUS PROVISIONS(Special Provision for Standards)
Article 28
In the case where the Minister of Internal Affairs finds that a metal coupling forfire defense pertaining to new technological development has a performance equivalent toor higher than a metal coupling for fire defense which conforms to the provisions of this Ordinance, the technical specifications specified by the Minister of Internal Affairs and Communications shall apply notwithstanding the provisions of this Ordinance of the Ministry.

SUPPLEMENTARY PROVISIONS(Effective Date)
Article 1
This Ordinance shall come into force as from April 1, 2014.
Appended Table 1 Table of Dimensions of Snap Type Spigot (Re: Article 7)
Class
Tolerance
NDC 75
NDC 65
NDC 50NDC 40NDC 30NDC 25

A

B
+0
-0.2
81.5
68.5
55.6
43.6
35.6
28.6

C

15.0
13.0
10.5
8.5
7.7
7.0

E
+0
-0.2
76.2
63.5
51.0
39.0
32.5
26.0

(Unit: mm)
N

J
+0
-0.2
18.0
15.5
14.5
11.7
10.0
8.5

+0
-0.2
83.0
70.5
56.5
44.0
36.0
29.0

Notes: 1) NDC: Nominal Diameter Class
2) The values in Columns B and N are the minimum values.
Figure of Ingo

22.8
19.5
14.7
12.5
11.3
10.2

Appended Table 2 Table of Dimensions of Snap Type Socket (Re: Article 8)
Class
Tolerance
NDC 75
NDC 65
NDC 50NDC 40NDC 30NDC 25

F

G
+0.5
-0
82.0
69.0
56.0
44.0
36.0
29.0

H
+0.2
-0
19.0
16.0
15.0
12.2
10.5
9.0

+0
-0.1
12.6
10.6
8.0
7.0
6.5
6.0

I

L
+0.1
-0
12.8
10.8
8.2
7.2
6.7
6.2

M

24.0
21.0
17.0
14.0
13.0
12.0

Notes: 1) NDC: Nominal Diameter Class
2) The values in Column L are the maximum values.
3) The values in Columns M and O are the minimum values.
Figure of Socket

83.8
70.8
56.8
44.3
36.3
29.3

(Unit: mm)
O

2.5
2.0
1.8
1.5
1.3
1.0

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses(Article Supplementary Provisions)
Appended Table 3 Variation of Tolerance of Male Screw of Insert for Screw Type Spigot(Re: Article 9)(Unit: mm)

NDC

NominalDiameterof Screw
N

150
140

Effective Diameter
K2

Outside Diameter
K
Round Type

Flat Type

Minor Diameter
K1

Upper
Limit of
Variation

Lower
Limit of
Variation

Upper
Limit of
Variation

Lower
Limit of
Variation

-0.86

-0.08

-0.42

-0.08

-0.93

-0.86

-0.08

-0.42

-0.08

-0.93

-0.55

-0.86

-0.08

-0.42

-0.08

-0.93

-0.86

-0.55

-0.86

-0.08

-0.42

-0.08

-0.93

-0.08

-0.86

-0.55

-0.86

-0.08

-0.42

-0.08

-0.93

-0.08

-0.86

-0.55

-0.86

-0.08

-0.42

-0.08

-0.93

95

-0.08

-0.86

-0.55

-0.86

-0.08

-0.42

-0.08

-0.93

65

82.5

-0.08

-0.73

-0.46

-0.73

-0.08

-0.38

-0.08

-0.79

50

60

-0.06

-0.51

-0.30

-0.51

-0.06

-0.30

-0.06

-0.55

40

48

-0.06

-0.51

-0.30

-0.51

-0.06

-0.30

-0.06

-0.55

30

40

-0.06

-0.51

-0.30

-0.51

-0.06

-0.30

-0.06

-0.55

25

34

-0.06

-0.51

-0.30

-0.51

-0.06

-0.30

-0.06

-0.55

20

25

-0.06

-0.44

-0.25

-0.44

-0.06

-0.24

-0.06

-0.44

Upper
Limit of
Variation

Lower
Limit of
Variation

Upper
Limit of
Variation

Lower
Limit of
Variation

175

-0.08

-0.86

-0.55

165

-0.08

-0.86

-0.55

125

150

-0.08

-0.86

115

140

-0.08

100

122.5

90

110

75

Note: NDC = Nominal Diameter Class
Appended Table 4 Table of Dimensions of Screw Type Spigot and Screw Type Socket(Re: Article 9 and Article 10)(Unit: mm)Class

NominalDiameterof ScrewN

SpigotD

Tolerancedl1

Socket
l2

±0.2

NDC

l3

L1

L2

L3

+0.2
-0

+0.2
-0

+0.2
-0

±0.2

+0.2
-0

NDC 150

175

152.2

163

31

20

5

23

7.5

3

NDC 140

165

142.2

153

31

20

5

23

7.5

3

NDC 125

150

128.2

139

31

20

5

23

7.5

3

NDC 115

140

121.2

129

31

20

5

23

7.5

3

NDC 100

122.5

105.2

113

31

20

5

23

6.5

3

NDC 90

110

93.2

101

31

20

5

23

6.5

3

NDC 75

95

78.2

86

30

20

4

22

6.5

2.5

NDC 65

82.5

67.2

75

27

18

3

19

6.5

2

NDC 50

60

49.2

55

20

13.5

1.5

13

5.5

1

NDC 40

48

38.2

43

20

13.5

1.5

13

5.5

1

NDC 30

40

30.2

35

18

12

1.5

12

5

1

NDC 25

34

24.2

29

16

11

1.5

10

4.5

1

NDC 20

25

17.2

21

13

9

1

8

4

Notes: 1) NDC = Nominal Diameter Class
2) The values in Column D are the maximum values.
3) The values in Column l1 are the minimum values.

FigureAppended Table 5 Basic Dimensions of Threads of Insert for Screw Type Spigot and Clamping Ring of Screw Type Socket (Re: Article 9 and Article 10)(Unit: mm)

Roundnessr

HalfAngle ofThread(0)O

Effective
Diameter
K2

OutsideDiameter ofMale Screw(Major
Diameter)
K

4.066

0.872

27.5

170.934175.0

166.868

4.066

0.872

27.5

160.934165.0

156.868

6.350

4.066

0.872

27.5

145.934150.0

141.868

4

6.350

4.066

0.872

27.5

135.934140.0

131.868

4

6.350

4.066

0.872

27.5

118.434122.5

114.368

110

4

6.350

4.066

0.872

27.5

105.934110.0

101.868

75

95

4

6.350

4.066

0.872

27.5

90.93495.0

86.868

65

82.5

5

5.080

3.253

0.697

27.5

79.24782.5

75.994

50

60

8

3.175

2.033

0.436

27.5

57.96760.0

55.934

40

48

8

3.175

2.033

0.436

27.5

45.96748.0

43.934

30

40

8

3.175

2.033

0.436

27.5

37.96740.0

35.934

25

34

8

3.175

2.033

0.436

27.5

31.96734.0

29.934

20

25

10

2.540

1.626

0.349

27.5

23.37425.0

21.748NDC

NominalDiameterof ScrewN

NumberofThreads(per
25.4mm)
n

150

175

140

165

125

Pitch
p

Height ofThreads ofMale Screw
h1

4

6.350

4

6.350

150

4

115

140

100

122.5

90

Note: NDC = Nominal Diameter Class
FigureMinor
Diameter(Inside Diameter of Female
Screw)
K1

Ordinance for Technical Specifications Pertaining to Snap or Screw Type Metal Couplings Used
for Fire Hoses and Screw Type Metal Couplings Used for Fire Suction Hoses(Article Supplementary Provisions)
Appended Table 6 Variation of Tolerance of Female Screw of Clamping Ring for Screw Type
Socket (Re: Article 10)(Unit: mm)

Major Diameter
K

Effective Diameter
K2

Inside Diameter
K1

NDC

Nominal Diameter ofScrew
N

Upper Limitof Variation

Lower Limitof Variation

Upper Limitof Variation

Lower Limitof Variation

Upper Limitof Variation

Lower Limitof Variation

150

175

Not specified

Not specified

+0.42

+0.08

+1.52

+1.02

140

165

+0.42

+0.08

+1.52

+1.02

125

150

+0.42

+0.08

+1.52

+1.02

115

140

+0.42

+0.08

+1.52

+1.02

100

122.5

+0.42

+0.08

+1.52

+1.02

90

110

+0.42

+0.08

+1.52

+1.02

75

95

+0.42

+0.08

+1.52

+1.02

65

82.5

+0.38

+0.08

+1.30

+0.84

50

60

+0.30

+0.06

+0.90

+0.54

40

48

+0.30

+0.06

+0.90

+0.54

30

40

+0.30

+0.06

+0.90

+0.54

25

34

+0.30

+0.06

+0.90

+0.54

20

25

+0.24

+0.06

+0.63

+0.44

Note: NDC = Nominal Diameter Class
Although the lower limit of variation of the major diameter of a female screw is not specified, a small gap shall be introduced between the bottom and the maximum outside diameter of a round type male screw.