本标准涵盖铸造等级125和250铜 合金螺纹管配件，具有替换规定 插头、衬套、盖、， 以及小尺寸的联轴器。本标准包括 以下内容:（a）压力温度额定值（b）异径管件开口的尺寸和指定方法（c）标记要求（d）铸件质量和材料的最低要求（e）SI（公制）和美国常用单位的尺寸和公差（f）螺纹要求（g）压力试验要求

This Standard covers cast Classes 125 and 250 copper alloy threaded pipe fittings with provisions for substituting wrought copper alloys for plugs, bushings, caps, and couplings in small sizes. This Standard includes the following:(a) pressure-temperature ratings(b) size and method of designating openings of reducing pipe fittings(c) marking requirements(d) minimum requirements for casting quality and materials(e) dimensions and tolerances in SI (metric) and U.S. Customary units(f) threading requirements(g) pressure test requirements