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See Chinese contents: GB/T 12716-2011 GB/T 12716-2011: Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
This Standard specifies the thread form, basic size, tolerance, marking and gauge of pipe thread (NPT and NPSC) with sealed thread pair and thread form angle of 60-degree. This Standard is applicable to sealed thread connection for pipe, valve, pipe joint, cock, and other pipe fittings.
