1. SCOPE

This standard prescribes dimensions, tolerances and material requirement of inspection gauges recommended for checking the taper threads on valve stems and the taper threads on cylinder necks for compressed gas cylinders having a taper of 1in 16 on diameter and as given in IS 3224 and IS 8737.

NOTE - This type of thread also conforms respectively to size 1/8, ¼, 3/8, ½, ¾ and 1— NGT of ANSI/CSA/CGA STANDARD V-1 — 1987 ‘Compressed gas cylinder valve outlet and inlet connection’, issued by American National Standard Institute and Compressed Gas Association, Inc.

2. REFERENCES

The standards listed below contain provisions, which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standard indicated below:

1586 (Part 1) : 2012 Metallic Material — Rockwell Hardness Test Part 1 Test method (Scales A, B, C, D, E, F, G, H, K, N, T) (fourth revision)

1570 (Part 2) : Schedules for wrought steels:

1979 Part 2 Carbon steels (unalloyed steels) (first revision)

3224 : 2002 Valve fittings for compressed gas cylinders excluding Liquefied petroleum gas (LPG) cylinders — Specification (third revision)

8737 : 2017 Valve fittings for use with liquefied petroleum gas (LPG) cylinders for more than 5 litre water capacity — Specification (second revision)