GB/T 7307-2001: Translated English of Chinese Standard (GBT 7307-2001, GB/T7307-2001, GBT7307-2001): Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
https://www.chinesestandard.net, 2017. 4. 12. - 11페이지
This Standard specifies the requirements for profiles, dimensions, tolerances and designation for pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads. This Standard applies to the threaded connection of pipes, valves, pipe joints, cocks and other pipe accessories.
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Basic dimensions and their tolerances