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| TEL:+86-10-63591520 |
| TEL:+86-10-63591500 |
| Email: |
| webmaster@cptdc.cnpc.com.cn |
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| Part 12 Thread Gauges | Thread gauges include special thread gauges, taper gauges, comb gauges and mono-tooth gauges for rotary shouldered connections, casings, tubings, line pipes and sucker rods. The size and accuracy of thread gauges are in conformity with API specification. The thread gauges are made of alloy steel with high abrasion resistance by means of special process to ensure the size is unchanged for long time use and long service life.
Standard and nonstandard thread gauges with different thread forms can be designed and produced according to customer′s requirements.
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| 1. Thread Gauges for Rotary Shouldered Connections
| Thread gauges for rotary shouldered connections are comprehensive measuring instruments for gauging the different connections. They are classified into four types: regular, (REG) full hole (FH) internal flush (IF) and numerical connection (NC). Each type of thread gauges has different sizes. They are used to check the threads on rotary shouldered connections, swivels, kellys and drill collars.
| | ● Specifications for Thread Gauges for Rotary Shouldered Connections | | NC | REG | FH | IF | Size
(in) | Pitch
mm
(T/in) | Taper
(in/ft) | Size
(in) | Pitch
mm (T/in) | Taper
(in/ft) | Size
(in) | Pitch
mm (T/in) | Taper
(in/ft) | Size
(in) | Pitch
mm (T/in) | Taper
(in/ft) | | NC23 | 6.35 (4) | 1:6 (2) | 2-3/8 REG | 5.08 (5) | 1:4 (3) | 3-1/2 FH | 5.08(5) | 1:4 (3) | 5-1/2 IF | 6.35 (4) | 1:6 (2) | | NC26 | 6.35 (4) | 1:6 (2) | 2-7/8 REG | 5.08 (5) | 1:4 (3) | 4-1/2 FH | 5.08(5) | 1:4 (3) | | | | | NC31 | 6.35 (4) | 1:6 (2) | 3-1/2 REG | 5.08 (5) | 1:4 (3) | 5-1/2 FH | 6.35(4) | 1:6 (2) | | | | | NC35 | 6.35 (4) | 1:6 (2) | 4-1/2 REG | 5.08 (5) | 1:4 (3) | 6-5/8 FH | 6.35 (4) | 1:6 (2) | | | |
| | | NC | REG | FH | IF | | NC38 | 6.35 (4) | 1:6 (2) | 5-1/2 REG | 6.35 (4) | 1:4 (3) | 2-7/8 FH | 5.08 (5) | 1:4 (3) | | | | | NC40 | 6.35 (4) | 1:6 (2) | 6-5/8 REG | 6.35 (4) | 1:6 (2) | | | | | | | | NC44 | 6.35 (4) | 1:6 (2) | 7-5/8 REG | 6.35 (4) | 1:4 (3) | | | | | | | | NC46 | 6.35 (4) | 1:6 (2) | 8-5/8 REG | 6.35 (4) | 1:4 (3) | | | | | | | | NC50 | 6.35 (4) | 1:6 (2) | | | | | | | | | | | NC56 | 6.35 (4) | 1:4 (3) | | | | | | | | | | | NC61 | 6.35 (4) | 1:4 (3) | | | | | | | | | | | NC70 | 6.35 (4) | 1:4 (3) | | | | | | | | | | | NC77 | 6.35 (4) | 1:4 (3) | | | | | | | | | |
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