ISO/TR 7470:2026

• Abstract:

  This document lists gas cylinders valve outlets in use. This document provides details of thread types and sizes. NOTE Complete descriptions of particular valve outlets are given in national standards.

• Status: Published
• Publication Date: 10-Aug-2026
• ICS: 23.020.35 - Gas cylinders
• Technical Committee: ISO/TC 58/SC 2 - Cylinder fittings
• Drafting Committee: ISO/TC 58/SC 2/WG 11 - Allocations of valve outlets
• Current Stage: 6060 - International Standard published
• Start Date: 11-Aug-2026
• Completion Date: 11-Aug-2026

• Revises: ISO/TR 7470:2023 - Gas cylinders — List of provisions
• Effective Date: 19-Oct-2024

ISO/TR 7470:2026 is an ISO Technical Report from ISO that lists gas cylinder valve outlets in use. It gives thread types and sizes, and it is meant to help readers identify the outlet references used for different gases and countries. Complete descriptions of individual valve outlets are given in national standards.

What does ISO/TR 7470:2026 specify?

ISO/TR 7470:2026 specifies a list of gas cylinder valve outlets in use and provides details of thread types and sizes. The report is organized into four clauses: Scope, Normative references, Terms and definitions, and Valve outlets by countries and by threads.

The practical value is in Clause 4, which points to the detailed outlet data. The document also states that complete descriptions of particular valve outlets are found in national standards, so this report works as a cross-reference rather than the full technical definition of each outlet.

What are the key requirements of ISO/TR 7470:2026?

ISO/TR 7470:2026 is mainly a reference list, so its key content is how to read and use the outlet information.

• Clause 1 limits the document to gas cylinder valve outlets in use and to thread types and sizes. In practice, this helps users identify the outlet family they need before checking the detailed national standard.
• Clause 4 says Table 1 lists each gas and the corresponding spreadsheet tabs. The spreadsheet contains the nominal dimensions, designations and references of valve outlets, arranged by country and by thread type.
• Clause 4 states that all pressures are given in bar. This matters because users need a common pressure unit when comparing outlet data across gases and national references.
• Clause 4 explains the pressure rating convention used in the list. For compressed gas, the rating normally corresponds to the working pressure of the gas cylinder; for liquefied gases, it corresponds to the test pressure of the gas cylinder.
• Clause 4 tells users to refer to the applicable valve outlet standard if there is doubt. That is important when a gas is used in more than one national system or when outlet references need confirmation.
• The note in Clause 1 says that complete descriptions of particular valve outlets are given in national standards. This means the report helps with identification and comparison, but the national standard is the place to check the full outlet specification.
• The foreword says the tables are provided in a spreadsheet available online. In practice, users should expect the detailed outlet list to be maintained in tabular form rather than only in printed text.

Who uses ISO/TR 7470:2026?

ISO/TR 7470:2026 is used by people working with gas cylinders and cylinder fittings who need to match a gas to a valve outlet thread type or national outlet reference. It is also relevant to manufacturers, designers and technical staff who check whether a cylinder connection matches the outlet used in a given country or application.

Because the report lists outlet provisions by gas and thread type, it is useful for standardization work, product definition and technical checking. It helps users compare outlet references before they consult the underlying national valve outlet standard.

What changed in ISO/TR 7470:2026 from the previous edition?

ISO/TR 7470:2026 cancels and replaces ISO/TR 7470:2023. The foreword says the fourth edition has been technically revised, and the main stated change is that the tables are provided in a spreadsheet available online.

What does the ISO/TR 7470:2026 document contain?

ISO/TR 7470:2026 contains the front matter, the scope, the statements on normative references and terms, and the clause on valve outlets by countries and by threads. The detailed list of gases is tied to spreadsheet tabs, and the spreadsheet carries the nominal dimensions, designations and references for the valve outlets.

The document also includes the note that complete outlet descriptions are found in national standards. For readers, that means the report is a navigation aid and comparison list, while the national standard is the place to verify the full valve outlet details.

Technical
Report
ISO/TR 7470
Fourth edition
Gas cylinders — List of provisions
2026-08
Bouteilles à gaz — Inventaire des dispositions
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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or ISO’s member body in the country of the requester.
ISO copyright office
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Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Valve outlets by countries and by threads . 1

iii
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings.
This fourth edition cancels and replaces the third edition (ISO/TR 7470:2023), which has been technically
revised.
The main changes are as follows:
— the tables have been provided in a spreadsheet available at:
https://standards.iso.org/iso/tr/7470/ed-4/en/
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html

iv
Technical Report ISO/TR 7470:2026(en)
Gas cylinders — List of provisions
1 Scope
This document lists gas cylinders valve outlets in use.
This document provides details of thread types and sizes.
NOTE Complete descriptions of particular valve outlets are given in national standards.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Valve outlets by countries and by threads
Table 1 lists the gas and the corresponding tabs in the spreadsheet available at: https:// standards .iso .org/
iso/ tr/ 7470/ ed -4/ en/ , where the nominal dimensions, designations and references of valve outlets found in
national standards are presented by country and by thread type. All of the pressures are given in bar. In
case of doubt, refer to the applicable valve outlet standard.
NOTE The pressure ratings are taken from the standards. The pressure rating for compressed gas normally
corresponds to the working pressure of the gas cylinder and for liquefied gases to the test pressure of the gas cylinder.
Table 1 — List of gas with the corresponding tabs
Valve outlets Valve outlets
Gas UN number
by countries by threads
1,1-DIFLUOROETHANE 1030 Table 1 Table 2
1,1,1,2-TETRAFLUOROETHANE (R134a) 3159 Table 3 Table 4
1,1,1-TRICHLOROTRIFLUOROETHANE Table 5 Table 6
1,1,2-TRICHLOROTRIFLUOROETHANE (R113) Table 7 Table 8
1,1-DICHLOROTETRAFLUOROETHANE (R114a) Table 9 Table 10
1,1-DIFLUOROETHYLENE 1959 Table 11 Table 12
1,2-DIBROMOTETRAFLUOROETHANE (R114B2) Table 13 Table 14
1,2-DICHLORODIFLUOROETHYLENE Table 15 Table 16
1,2-DICHLOROETHYLENE (R1130) 1150 Table 17 Table 18
1,2-DICHLOROHEXAFLUOROCYCLOBUTANE (RC316) Table 19 Table 20
1,3-BUTADIENE-1,3 1010 Table 21 Table 22

TTabablele 1 1 ((ccoonnttiinnueuedd))
Valve outlets Valve outlets
Gas UN number
by countries by threads
1.1.1TRIFLUOROETHANE OR R143A 2035 Table 23 Table 24
1-CHLORO 1,1-DIFLUORETHANE 2517 Table 25 Table 26
1-CHLORO-1,2,2,2-TETRAFLUOROETHANE (R124) Table 27 Table 28
1-CHLORO-2,2,2-TRIFLUOROETHANE (R133a) Table 29 Table 30
2,3,3,3-TETRAFLUORO-1-PROPENE (R1234yf) Table 31 Table 32
2-METHYLPROPENE 1055 Table 33 Table 34
3-METHYL-1-BUTENE 2561 Table 35 Table 36
ACETYLENE 1001 Table 37 Table 38
AMMONIA 1005 Table 39 Table 40
ARGON 1006 Table 41 Table 42
ARSINE 2188 Table 43 Table 44
BORON TRICHLORIDE 1741 Table 45 Table 46
BORON TRIFLUORIDE 1008 Table 47 Table 48
BREATHABLE GAS MIXTURES (UNCO < 7% O.I. > O.I. (UNAIR)) Table 49 Table 50
BREATHABLE GAS MIXTURES (UNO.I.=O.I.(UNAIR)) Table 51 Table 52
BROMINE CHLORIDE 2901 Table 53 Table 54
BROMINE PENTAFLUORIDE 1745 Table 55 Table 56
BROMINE TRIFLUORIDE 1746 Table 57 Table 58
BROMOCHLORODIFLUOROMETHANE (R12B1) 1974 Table 59 Table 60
BROMOCHLOROMETHANE 1887 Table
...