ISO 5145; Cylinder Valve Outlets for Gases and Gas Mixtures - Selection and Dimensioning
ISO 5145 Scope
This International Standard establishes practical criteria for determining valve outlet connections for gas cylinders. It applies to the selection of gas cylinder valve outlet connections and specifies the dimensions for a number of them. This international standard does not apply to connections used for cryogenic gas withdrawal or gases for breathing equipment which are subject of other international standards. WARNING - The gas cylinder valve outlet connection is not the only safeguard against accidental misuse; gas cylinder labeling and color codes shall be checked before use.
Thread Requirements Because this host website is only interested in screw threads; the only part of this standard which we are interested in is the screw threads. The ISO 5145 lists three thread sizes which we have identified as: W24x2.0; W27x2.0 and W30x2.0. The tolerances are listed in Table 2 on Page 6 (of the 2014 version). The tolerance match those given in ISO 965-1 for the commonly used 6g/6H fit combination. These three screw thread sizes listed in ISO 5145 are identical to three of the five sizes listed in the now obsolete NF E 29-650 pg 29 Fig 19.
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Original Posting: 12/11/2012
Last Revision: 6/17/2019
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