本文件规定了产品特性、评估方法、试验结果的符合性标准以及螺纹配件的命名系统。这些螺纹端带有金属和非金属密封件，用于连接管道、管件或阀门，螺纹端的尺寸范围为3175 mm（1/8“）至101.6 mm（4“）。螺纹接头的设计使用寿命可达50年。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies product characteristics, assessment methods, compliance criteria of the test results and a designation system for threaded fittings. These threaded ends exist with metallic and with non-metallic sealing elements for the purposes of joining with tubes, pipes, fittings or valves, the threaded ends have a size range from 3,175 mm (1/8") to 101,6 mm (4"). The threaded fittings are designed for a service lifetime up to fifty years.All current amendments available at time of purchase are included with the purchase of this document.