ISO/TR 11364:2012

TECHNICAL ISO/TR
REPORT 11364
First edition
2012-12-01
Gas cylinders — Compilation of
national and international valve stem/
gas cylinder neck threads and their
identification and marking system
Bouteilles à gaz — Compilation des filetages nationaux et
internationaux des queues de robinets/goulots de
bouteilles et leurs systèmes d’identification et de marquage
Reference number
©
ISO 2012
© ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Interchangeability of valve/cylinder threads . 1
4 Lists of threads . 1
4.1 General . 1
4.2 List of threads . 2
4.3 Tables of threads listed by country .11
Bibliography .25
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
In exceptional circumstances, when a technical committee has collected data of a different kind from
that which is normally published as an International Standard (“state of the art”, for example), it may
decide by a simple majority vote of its participating members to publish a Technical Report. A Technical
Report is entirely informative in nature and does not have to be reviewed until the data it provides are
considered to be no longer valid or useful.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TR 11364 was prepared by Technical Committee ISO/TC 58, Gas cylinders.
iv © ISO 2012 – All rights reserved

Introduction
There is a huge variety of valve to gas cylinder neck thread connections worldwide and ISO cylinders
are free to be equipped with any thread according to a recognized thread standard. ISO standards for
cylinders and valves require the marking of an identification of the thread on valve and cylinder but
there is presently no harmonized marking system.
The purpose of this Technical Report is to list all known cylinder/valve threads currently used and also
threads used in the past and to specify a harmonized identification code and marking system for both
cylinders and valves. The aim is to reduce the risk of mismatches when valves are fitted to gas cylinders
and avoid related safety incidents.
TECHNICAL REPORT ISO/TR 11364:2012(E)
Gas cylinders — Compilation of national and international
valve stem/gas cylinder neck threads and their
identification and marking system
1 Scope
This Technical Report lists the different valve stem to gas cylinder connection threads currently
and historically existing worldwide and provides official coded designations for them. These coded
designations will then be available for identification and marking purposes.
It also gives guidance concerning which threads are dimensionally identical and which are
interchangeable.
Furthermore, this Technical Report provides guidance for valving procedures when fitting valves to
gas cylinders.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
3 Interchangeability of valve/cylinder threads
Threads of recognized standards which are dimensionally identical but have historically been named
differently are fully interchangeable.
Experience has shown that the following combination of threads can be safely used in service: 25E
valve with T8, T23 and T26 cylinder threads. However, for small steel (less than 5 l water capacity) and
aluminium alloy cylinders, users should examine the suitability of the resulting combination for each
application in order for them to be interchangeable.
4 Lists of threads
4.1 General
The lists of threads are given in Table 1 for taper threads and Table 2 for parallel threads. The columns
in the tables have the following meaning:
Column 1 – Ref. No.
Reference Number of the thread starting with a “T” for taper threads and “P” for parallel threads;
followed by a consecutive number in the order as they are listed.
Column 2 – Origin
Country or region of origin of the thread.
Column 3 – Nominal designation of thread
Nominal dimensional identification or designation of the thread given in its originating standard or
specification.
Column 4 – Specification or standard
Specification or standard from which the thread originated (see also the bibliography).
Column 5 – Official mark to standard
If the originating standard indicates an official abbreviated identification mark or code, it is given
in this column.
Column 6 – Identification and marking
This column indicates an identification code for the relevant thread assigned under this Technical
Report which shall in future be used for marking purposes.
NOTE This simplified marking code covers for parallel threads the thread size only and not the geometry of
the sealing area or surface.
Column 7 – Note
This column indicates specific equivalency or interchangeability with other threads listed.
Column 8 – Recommended valving procedure
This column indicates the recommendations for fitting valves to gas cylinders, in particular the
recommended torque values to be used, which normally follow the requirements of ISO 13341.
4.2 List of threads
See Table 1.
2 © ISO 2012 – All rights reserved

Table 1 — List of national and international valve/gas cylinder threads
Nominal designation of Specification or Official mark to Identification Recommended valv-
Ref. no. Origin Note
thread standard standard and marking ing procedure
T1 EU 17E ISO 11116-1 17E 17E T1, T2, T3 and T39, T57, T58, T60 See ISO 13341
and T64 are fully interchangeable
threads.
T2 EU E17 con EN 144-1 E17con T1, T2, T3 and T39, T57, T58, T60
and T64 are fully interchangeable
threads.
T3 Germany W19,8×1/14 keg6°52′ (3:25) DIN 477-1 T1, T2, T3, T39, T57, T58, T60 and
taper T64 are fully interchangeable
threads.
T4 EU 25E EN 629-1 25E 25E T4, T5, T6,, T38, T59 and T61 are See ISO 13341
(ISO 10920) fully interchangeable threads
T5 German W28,8×1/14 keg DIN 477-1 T4, T5, T6, T38, T58, T59 and T61
are fully interchangeable threads
T6 UK W1,000” ×1/14 (3:25) taper BS 341-1:1991 25T T4, T5, T6, T38, T58, T59 and T61
are fully interchangeable threads
T7 Australia Special taper stem thread, AS2473.2-2007 25AU 25AU T8 is a fully interchangeable thread AS 2337.1-2004
1.0 inch Nominal, 14 threads
per inch, 1 in 8 taper on
diameter
T8 UK 1 inch Nominal. 14 threads BS 341-1:1962 1”BS Cylinders with this thread can ISO 13341 may be used
per inch. 1 in 8 taper on accept valves with T4, T5, T6, T7 for guidance (torque
diameter and T38 values as for 25E)
T9 German W31,3×1/14 keg6°52′ (3:25) DIN 477-1 28E T9, T11, T12, T62 and T63 are fully ISO 13341 may be used
taper interchangeable threads for guidance
T10 Denmark W31,3×1/14 (3:25) taper DS 729 For acetylene only
T11 Italy W28,3×1/14” UNI 11144 T9, T11, T12, T62 and T63 are fully
interchangeable threads
T12 France 28,3 ×1/14taper angle 6°52′ NF E 29-676 (28E) T9, T11, T12, T62 and T63 are fully
interchangeable threads
T13 UK W0,6”×1/1410° incl. angle BS 341-2:1963 (15T) 15T T13 and T14 are equivalent threads ISO 13341 may be used
for guidance (torque
values as for 17E)
T14 Australia 06-15AU(1/14) AS 2473.2-2007 15AU 15AU T13 and T14 are fully interchange- AS 2337.1-2004
able threads
4 © ISO 2012 – All rights reserved
Table 1 (continued)
Nominal designation of Specification or Official mark to Identification Recommended valv-
Ref. no. Origin Note
thread standard standard and marking ing procedure
T15 UK W0,635”×1/18. 8° incl. angle BS 341-1:1991 (16T) 16T ISO 13341 may be used
for guidance (torque
values as for 17E)
T16 UK SI 0,694”× 1/14. 6° incl. BS 341-1:1962 (UK (17T) 17T For propane
taper angle LPGA Code of prac-
tice 15 Part 2)
T17 UK Ireland W0,715”×1/14. 1:8 incl. BS 341-1:1991 18T 18T T17 and T18 are fully interchange- ISO 13341 may be used
taper angle able threads for guidance (torque
values as for 17E)
T18 Australia Special taper stem thread, AS 2473.2-2007 18AU 18AU T17 and T18 are fully interchange- AS 2337.1-2004
0.715 inch Nominal, 14 able threads
threads per inch, 1 in 8 taper
on diameter
T19 Has been
deleted but
the following
T numbers
have not yet
changed
T20 UK W0,735”×1/14. 1:8 incl. BS 341-1:1991 19T 19T ISO 13341 may be used
taper angle for guidance (torque
values as for 17E)
T21 UK W1,025” ×1/14. 10° incl. BS 341-1:1991 26T 26T ISO 13341 may be used
taper angle for guidance (torque
values as for 25E)
T22 UK W1,25”×1/14. 1:8 incl. taper BS 341-1:1991 32T 32T ISO 13341 may be used
angle for guidance
T23 Sweden W28, taper 3:24,5 SMS2235 (W28,0) 25S Cylinders with this thread can ISO 13341 may be used
accept valves with T4, T5, T6 and for guidance (torque
T38 values as for 25E)
T24 Has been
changed in
P54 but the
following
T numbers
have not yet
changed
T25 France 16,4×1/14taper angle 8°40′ NF E 29-678 (16F) 16F

Table 1 (continued)
Nominal designation of Specification or Official mark to Identification Recommended valv-
Ref. no. Origin Note
thread standard standard and marking ing procedure
T26 France 25,8×1/14taper angle 6°38′ NF E 29 680 (25F) 25F Cylinders with this thread can ISO 13341 may be used
accept valves with T4, T5, T6 and for guidance (torque
T38 values as for 25E)
T27 France 34×2taper angle 5° NF E 29 682 (34F) 34F T27 and T28 are fully interchange-
able threads
T28 Italy M34×2 UNI 11144 34F T27 and T28 are fully interchange-
able threads
T29 France 26 ×1/14taper angle 3°34′ NF E 29684 (26F3) 26F3 Thread similar to T40 (3/4”NGT)
(1:16) but not equivalent.
T30 France RC1H” 11TPI, taper 3°34′ NF E 03004 Not used
(1:16)
T31 Japan W39-12TPI, taper 3:26, JIS B 8244 none 39J For acetylene
profile -. to surface
T32 Japan W20-14TPI, taper 3:26, pro- JIS B 8245 V1 None JV1A For LPG
file -. to axis
T33 Japan W20-14TPI taper 3:26, pro- JIS B 8246 V1 None JV1S
file -. to surface
T34 Japan W28-14TPI taper 3:26, pro- JIS B 8245 V2 None JV2A For LPG
file -. to axis
T35 Japan W28-14TPI taper 3:26, pro- JIS B 8246 V2 None JV2S
file -. to surface
T36 Japan W28-14TPI taper 3:26, pro- JIS B 8246 V3 None JV3S Short length
file -. to surface
T37 China W39-12TPI taper 3:25profile GB 8335-1998 Pz39 39C
-. to surface
T38 China W27,8-14TPI taper 3:25pro- GB 8335-1998 Pz27,8 25E T4, T5, T6 and T38 are fully inter- See ISO 13341
file -. To surface changeable threads
T39 China W19,2-14TPI taper 3:25 GB 8335-1998 Pz19,2 17E T1, T2 and T3 a
...