Specifies requirements for valve outlet connections (threaded) and stem (inlet) threads for use with gas cylinders in general applications.

This Standard specifies cylinder valve outlet connections (threaded). These connections are intended to be used with a nominated range of gases and within defined cylinder filling pressure ranges in order to minimize the possibility of hazardous misconnections and the use of downstream equipment at incorrect pressures.Dimensional details of the outlet connecting parts are included so that each connection, designated by its Type number, is fully defined and complete.The Standard also specifies some stem (inlet) and cylinder neck threads suitable to connect cylinders valves with cylinders, as well as gauging systems to ensure the accuracy of these threads.Although the main purpose in standardizing cylinder valve outlet connections is to prevent interconnection with incompatible gases or cylinder pressures, relying only on the valve outlet connection to prevent such interconnections is neither possible nor advisable. The primary means for identifying the contents of compressed gas cylinders is the cylinder markings, including labels.WARNING: THE CYLINDER VALVE OUTLET CONNECTION IS NOT THE ONLY SAFEGUARD AGAINST ACCIDENTAL MISUSE. THE GAS CYLINDER MARKINGS SHOULD BE CHECKED BEFORE EVERY USE.NOTES:1 Specifications of the outlet connections for medical gases applications are given in AS 2473.3.2 Specifications for outlet connections for use with SCUBA and SCBA applications are not given at this time. ISO 12209 Parts 1 to 3 specifies one such system.

First published as AS B240-1966.AS CB4 Interpretation 11 first published 1977.AS B240-1966 and AS CB4 Interpretation 11-1977 revised, amalgamated and redesignated AS 2473-1981.Second edition 1985.Third edition 1990.Revised in part and redesignated as AS 2473.2-2007.Fourth edition 1996. Originated as part of AS B240-1966. Previous edition part of AS 2473-1996. Revised in part and redesignated as AS 2473.2-2007.