1.1 本规范涵盖适用于连接碳钢管道的锻制碳钢套筒式管接头。 1.2 I型联轴器适用于管道壁厚不超过标准重量管道壁厚的所有管道一览表。II型联轴器适用于管道壁厚不超过超强管道壁厚的所有管道一览表。 1.3 本规范不包括铸钢联轴器。 注1: 看见 附录X1 用于制定本规范的基本原理。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers wrought carbon steel sleeve-type pipe couplings suitable for joining carbon steel pipes. 1.2 Type I couplings are intended for use on all schedules of pipe in which the pipe wall thickness does not exceed the wall thickness of standard weight pipe. Type II couplings are intended for use on all schedules of pipe in which the pipe wall thickness does not exceed the wall thickness of extra strong pipe. 1.3 This specification does not cover cast steel couplings. Note 1: See Appendix X1 for rationale used to develop this specification. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.