This standard specifies the essential procedures to be followed when connecting cylinder valves to gas cylinders. It applies to all valve and cylinder combinations connected with ISO screw threads given in the normative references. It defines routines for inspection and preparation prior to valving for both taper and parallel screw threads.Torque values are given in Annex A for steel and aluminium gas cylinders including composite cylinders with steel or aluminium connectors.NOTE ISO/TR 11364 lists the valve to gas cylinder threads in use worldwide. This report gives details of the thread identification codes, whether the threads are interchangeable with IS