ISO 11363-1:2018规定了公称直径为17,4 mm（标为17E）和25.8 mm（标为25E）的锥形螺纹的尺寸和公差，用于将阀连接到气瓶。 ISO 11363-1:2018不包括连接要求 - 机械强度， - 气密性，和 - 重复组装和拆卸操作的能力。 仪表检测由ISO 11363-2覆盖。

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.