本文件列出了目前和历史上世界范围内存在的不同阀杆至气瓶连接螺纹，并提供了它们的官方编码名称。这些编码名称将用于识别和标记目的。 它还提供了关于哪些螺纹尺寸相同，哪些螺纹可互换的指南。 此外，本文件还提供了将阀门安装到气瓶上时的阀门安装程序指南。

This document lists the different valve stem to gas cylinder connection threads currently and historically existing worldwide and provides official coded designations for them. These coded designations will then be available for identification and marking purposes. It also gives guidance concerning which threads are dimensionally identical and which are interchangeable. Furthermore, this document provides guidance for valving procedures when fitting valves to gas cylinders.