ISO 11363-1:2018 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated as 17E) and 25,8 mm (designated as 25E) used for the connection of valves to gas cylinders. ISO 11363-1:2018 does not cover the connection requirements for - mechanical strength, - gas tightness, and - capability of repeated assembly and dismounting operations. Gauge inspection is covered by ISO 11363‑2.
EN ISO 11363-1:2018 history
2023EN ISO 11363-1:2018/A1:2023 Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications - Amendment 1 (ISO 11363-1:2018/Amd 1:2023)
2018EN ISO 11363-1:2018 Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1:2018)
2010EN ISO 11363-1:2010 Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (Incorporating corrigenda April 2011 and January 2012)