给出了通用平端管和精密管的值。其目的是为所有与钢管标准化相关的活动提供尺寸选择指南，包括国内和国际标准化活动，作为一个现成的计算工具，避免不同质量的不同国家使用相同尺寸的钢管。本标准不适用于主要用于拧紧的管道。第四版取消并取代了第三版（1985年），其中表2和表3通过增加外径12进行了技术修订。 7毫米至系列2。

Gives values of both plain end tubes for general purpose use and precision tubes. Its purpose is to give guidance on the selection of sizes for all activities concerned with the standardization of steel tubes, both nationally and internationally, to serve as a ready reckoner and to avoid the use by different countries of different masses for a tube of the same size. It is not applicable to tubes primarily intended to be screwed. This fourth edition cancels and replaces the third edition (1985), tables 2 and 3 of which have been technically revised by the addition of the outside diameter of 12.7 mm to series 2.