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

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Scope

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.
If this connection requires pressure-tightness. In addition to threads, it shall design
pressure-tight surface structures (such as conical surfaces, flat end surfaces, etc.).
Inside the pressure-tight surface it shall add the appropriate pressure-tight medium,
and use threads to seal the pressure-tight surface.

Basic Data

Standard ID	GB/T 7307-2001 (GB/T7307-2001)
Description (Translated English)	Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J04
Classification of International Standard	21.040.20
Word Count Estimation	6,639
Date of Issue	2001-02-26
Date of Implementation	2001-09-01
Older Standard (superseded by this standard)	GB/T 7307-1987
Quoted Standard	GB/T 14791-1993;
Adopted Standard	ISO 228-1-1994; MOD
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard specifies: tooth type angle of 55��, thread sealing vice itself does not have a cylindrical pipe thread tooth type, dimensions, tolerances and markings. This standard applies to: pipes, valves, fittings, cocks and other piping accessories threaded coupling. If you require this connection with tightness, should be designed sealing surface structure (eg conical surface, flat face, etc.) outside of the thread. Add in the sealed surface suitable sealing medium, use thread sealing surface locking seal.