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See Chinese contents: GB/T 7307-2001 GB/T 7307-2001: Pipe threads with 55-degree thread angle where pressure-tight joints are not made on the threads
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.
