What Is Pipe Thread?

The pipe thread is a thread located on the pipe wall for connection. There are 55 degree unsealed pipe threads and 55 degree sealed pipe threads. It is mainly used to connect pipes to make the internal and external threads fit tightly. There are two kinds of straight pipes and tapered pipes.

Pipe thread

The pipe thread is located on the pipe wall for connection

Common pipe threads include the following: NPT, PT, G, etc.

1) NPT is the abbreviation of National (American) Pipe Thread, which belongs to

Current national standards

Implementation of serial number code name

1 GB / T9253.2-1999 Petroleum, natural gas industry casing, tubing and line pipe thread processing, measurement and inspection

Implemented on 1999-12-01, replacing GB / T 9253.2-1988, GB / T 9253.3-1988, GB / T 9253.4-1988, GB / T9253.5-1988, GB / T 9253.6-1988, GB / T 9253.7-1988

2 GB / T7306.1-200055 ° sealed pipe threads Part 1: Pipe internal threads and tapered external threads Pipe threads with 55 degree thread angle where pressure-tightjoints are made on the threads--Part 1: Parallel internal and taper externalthreads

Implemented 2000-12-01, replacing GB / T 7306-1987

3 GB / T7306.2-2000 55 ° sealed pipe threads Part 2: Tapered internal threads and tapered external threads Pipe threads with 55 degree thread angle where pressure-tightjoints are made on the threads--Part 2: Taper internal and external threads 2000 Implemented -12-01, replacing GB / T 7306-1987

4 GB / T7307-2001 55 ° unsealed pipe threads Pipe threads with 55 degree thread angle where pressure-tightjoints are not made on the threads 2001-09-01, replaced GB / T 7307-1987

5 GB / T18052-2000 Gauging and inspection ofcasing, tubing andline pipe threads 2000-10-01

6 GB / T10922-2006 55 ° unsealed pipe thread gauge Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads 2006-08-01, replaced GB / T 10922-1989

7 GB / T20324-2006 Circular dies for parallelpipe threads-G series 2007-01-01

8 GB / T20333-2006 Taps for parallel and taper pipe threads General dimensions and marking 2007-01-01

9 GB / T20334-2006 G series and Rp series thread thread tolerances for thread taps Ground thread taps for pipethreads G series and Rp series-Tolerances on the threaded portion 2007-01-01

10 GB / T20328-2006 Circular dies for taper pipe threads-R series 2007-01-01

11 GB / T21267-2007 Petroleum and natural gas industry-Procedures for testing casing and tubing connections 2008-06-01

12 GB / T22091.1-2008 55 ° sealed pipe thread gauges Part 1: Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads -Part 1: Verification of parallel internal and taper external threads 2009-01-01

13 GB / T27944-2011 60 ° Dryseal pipe threads with the thread angle of 60 degrees

14 GB / T12716-2011 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads

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