Essential mechanical properties of materials for gas cylinder valves for breathing purposes (other than medical). Thread dimensions for four sizes of valve stems plus details of manufacturing gauges. Dimensional drawings for valve outlet connections.Cross References:BS 18BS 84BS 131:Part 1BS 350 BS 399BS 400BS 401BS 919BS 1045BS 1806BS 2033BS 2779Free of charge.Partially replaced by BS 341-1:1991, BS EN 849:1997 and BS EN ISO 12209 Parts 1-3.Incorporates the following:PD 5015