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ISO 11191:1997 Gas cylinders -- 25E taper thread for connection of valves to gas cylinders -- Inspection gauges
standard by International Organization for Standardization, 03/01/1997
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This International Standard specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper thread specified in ISO 10920.
Annex A provides examples of calculations for thread gauge dimensions on the large end diameter.
Annex B draws attention to the limitations of the gauging system specified.