Standard No.:	GB/T 7307-2001
Chinese Name:	55°非密封管螺纹
English Name:	Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
Professional Classification:	J04 Basic standards and general methods
Professional Classification:	GB National Standard
ICS Classification:	21.040.20 Inch screw threads
Issued by:
Issued on:	2001-02-02
Implemented on:	2001-09-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Scope

This standard specifies the thread form, dimensions, tolerances and designation for parallel pipe thread with 55 degree thread angle where pressure-tight joints are not made on the threads pairs.
This standard is applicable to the threaded connection of the pipe, valve, pipe joint, cock and other pipeline fittings.
If assemblies with such threads must be pressure tight, this should be effected by compressing tightening surfaces (such as conical surface and plain-end surface) outside the threads by interposing an appropriate seal.

2 Normative References

The following standard contains provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and the parties coming to an agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards below.
GB/T 14791-1993 The Terms of Screw Threads