本版本取代了ISO 2016-1971推荐标准R。指定应用领域、装配尺寸及其公差、配件的材料和试验。组件直径从6毫米到108毫米不等。包括通止塞规（表5）和通止环凿（表6）。

This edition cacels and replaces the ISO Recommendation R 2016 - 1971. Specifies the field of application, the assembly dimensions and their tolerances, the materials and tests for fittings. The assembly diameters ranging from 6 mm up to and including 108 mm. Comprises GO and NOT GO plug gauges (table5), and GO and NOT GO ring gouges (table 6).