This article highlights the causes, uses and advantages of developing a national standard for metric taper threads. Briefly introduce the tooth types, dimensions, tolerance inspection and marking methods specified in the new standard, as well as the differences and relationships between new and old standards. Provide readers to choose and reference in many pipe thread standards. 1. The idea of ​​using metric taper threads and the revision of the national standard for metric taper threads. Most of the pipe threads used in the past and the present are from the inch system. In recent years, with the implementation of the international system of units,
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