API 5CT steel couplings, also known as OCTG steel couplings, used to connect petroleum casing and tubing, is usually manufactured in seamless type, and its material grade is same with the pipe body of casing and tubing (API 5CT K55/J55, N80, L80, P110 etc), same PSL or providing higher grades than requested. BTC means buttress thread casing pipes, and different casing pipes need different couplings to connect.
Specification
| Standard | API 5CT latest edition | |||||||
| Grade | H40, J55, K55,N80-1, N80-Q, R95, L80-1, C90, T95, P110 | |||||||
| Outer Diameter | 114.3mm – 508 mm (from 4.5’’ to 20’’ ) | |||||||
| Thread Type | STC, LTC,and BTC | |||||||
| Packing | Thread protector,black paint and bundling | |||||||
| Section Shape | Round | |||||||
| Place of Origin | China | |||||||
| Technique | Seamless hot rolled | |||||||
| Application | Connecting casing pipes and tubing pipes | |||||||
| Place of Origin | China | |||||||
| MOQ | 1 ton | |||||||
| Transportation | 1.Sea port:Tianjin Xingang port,Qingdao port,Shanghai Luojing port →America,Europe,Africa,Middle East,India, Pakistan,Japan,Korea, Australia…(shipping) 2.Land port:Alataw pass port(Пограничный пункт “Алашанькоу”) |
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| Dimension, tolerance and weight of Coupling for buttress thread casing | ||||||||
| Code name | Specification | OD tolerance |
Minimum length | Boring diameter Q In. |
Width bearing surface B In. |
Weight Lb |
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| OD Inches |
Standard coupling In. | Special clearance In. |
In. | Standard coupling In. | Special clearance In. |
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| 4 1/2 | 4.500 | 5.250 | 4.875 | 8 7/8 | 4.640 | 1/4 | 15.19 | 7.68 |
| 5 | 5.000 | 5.800 | 5.375 | 9 1/8 | 5.140 | 9/32 | 18.46 | 8.82 |
| 5 1/2 | 5.500 | 6.300 | 5.875 | 9 1/4 | 5.640 | 9/32 | 20.50 | 9.85 |
| 6 5/8 | 6.625 | 7.390 | 7.000 | 9 5/8 | 6.765 | 1/4 | 24.49 | 12.46 |
| 7 | 7.000 | 7.875 | 7.375 | 10 3/8 | 7.140 | 5/16 | 30.82 | 13.84 |
| 7 5/8 | 7.625 | 8.500 | 8.125 | 10 5/8 | 7.765 | 5/16 | 34.88 | 20.47 |
| 8 5/8 | 8.625 | 9.625 | 9.125 | 10 5/8 | 8.765 | 3/8 | 45.99 | 23.80 |
| 9 5/8 | 9.625 | 10.625 | 10.125 | 10 5/8 | 9.765 | 3/8 | 51.05 | 26.49 |
| 10 3/4 | 10.750 | 11.750 | 11.250 | 10 5/8 | 10.890 | 3/8 | 56.74 | 29.52 |
| 11 3/4 | 11.750 | 12.750 | — | 10 5/8 | 11.890 | 3/8 | 61.80 | — |
| 13 3/8 | 13.375 | 14.375 | — | 10 5/8 | 13.515 | 3/8 | 70.03 | — |
| 16 | 16.000 | 17.000 | — | 10 5/8 | 16.154 | 3/8 | 88.81 | — |
| 18 5/8 | 18.625 | 20.000 | — | 10 5/8 | 18.779 | 3/8 | 138.18 | — |
| 20 | 20.000 | 21.000 | — | 10 5/8 | 20.154 | 3/8 | 110.45 | — |
