The API coupling is an internally threaded cylinder for connecting two threaded pipes. It is an integral part of the tubing and casing. Each tubing or casing should be equipped with an API coupling. The casing with different thread types selects different types of this fitting. Therefore, the product is mainly divided into buttress thread and round thread types, which correspond to buttress and round thread casing respectively.
Specifications
1. Steel grade
J55, K55, N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr, C90, T95, P110, Q125, etc.
2. Outside diameter
Tubing coupling: 2 3/8", 2 7/8", 3 1/2", 4", 4 1/2"
Casing coupling: 4 1/2", 5", 5 1/2", 6 5/8", 7", 7 5/8", 9 5/8", 10 3/4", 13 3/8", 16", 18 5/8", 20"
3. Thread type
Long round thread(LC), short round thread(SC), buttress thread(BC), special thread, etc.
The API couplings for tubing and casing pipes
| Size and Specifications For Tubing and Casing Couplings |
| Descriptions and size | Type of Thread | O.D*L
(mm) | Weight
(kg) |
Tubing Coupling
| 1.050 | NUE | 33.35*80.96 | 0.23 |
| 1.050 | EUE | 42.16*82.55 | 0.38 |
| 1.315 | NUE | 42.16*82.55 | 0.38 |
| 1.315 | EUE | 48.26*88.90 | 0.57 |
| 1.660 | NUE | 52.17*88.90 | 0.59 |
| 1.660 | EUE | 58.88*95.25 | 0.68 |
| 1.900 | NUE | 55.88*95.25 | 0.56 |
| 1.900 | EUE | 63.50*98.42 | 0.84 |
| 2-3/8" | NUE | 73.02*107.95 | 1.28 |
| 2-3/8" | EUE | 77.80*132.82 | 1.55 |
| 2-7/8" | NUE | 88.90*130.18 | 2.34 |
| 2-7/8" | EUE | 93.17*133.35 | 2.40 |
| 3-1/2" | NUE | 107.95*142.88 | 3.71 |
| 3-1/2" | EUE | 114.30*146.05 | 4.10 |
| 4" | NUE | 120.65*146.05 | 4.35 |
| 4" | EUE | 127.00*152.40 | 4.82 |
| 4-1/2" | NUE | 132.08*155.58 | 4.89 |
| 4-1/2" | EUE | 141.30*158.75 | 6.05 |
Casing Coupling
| 4-1/2" | STC | 127.00*158.75 | 5.23 |
| 4-1/2" | LTC | 127.00*177.80 | 4.15 |
| 4-1/2" | BTC | 127.00*225.42 | 4.55 |
| 5" | STC | 141.30*165.10 | 4.66 |
| 5" | LTC | 141.30*196.85 | 5.75 |
| 5" | BTC | 141.30*231.78 | 5.85 |
| 5-1/2" | STC | 153.67*171.45 | 5.23 |
| 5-1/2" | LTC | 153.67*203.20 | 6.42 |
| 5-1/2" | BTC | 153.67*234.95 | 6.36 |
| 6-5/8" | STC | 187.71*184.15 | 9.12 |
| 6-5/8" | LTC | 187.71*222.25 | 11.34 |
| 6-5/8" | BTC | 187.71*244.48 | 11.01 |
| 7" | STC | 194.46*184.15 | 8.39 |
| 7" | LTC | 194.46*228.60 | 10.83 |
| 7" | BTC | 194.46*254.00 | 10.54 |
| 7-5/8" | STC | 215.90*190.50 | 12.30 |
| 7-5/8" | LTC | 215.90*234.95 | 15.63 |
| 7-5/8" | BTC | 215.90*263.52 | 15.82 |
| 8-5/8" | STC | 244.48*196.85 | 16.23 |
| 8-5/8" | LTC | 244.48*254.00 | 21.67 |
| 8-5/8" | BTC | 244.48*269.88 | 20.86 |
| 9-5/8" | STC | 269.88*196.85 | 18.03 |
| 9-5/8" | LTC | 269.88*266.70 | 25.45 |
| 9-5/8" | BTC | 269.88*269.88 | 23.16 |
| 10-3/4" | STC | 298.45*203.20 | 20.78 |
| 10-3/4" | BTC | 298.45*269.88 | 25.74 |
| 11-3/4' | STC | 323.85*203.20 | 22.64 |
| 11-3/4' | BTC | 323.85*269.88 | 28.03 |
| 13-3/8" | STC | 365.12*203.20 | 25.66 |
| 13-3/8" | BTC | 365.12*269.88 | 31.77 |
| 16" | STC | 431.80*228.6 | 34.91 |
| 16" | BTC | 431.80*269.88 | 40.28 |
| 18-5/8" | STC | 508.00*228.60 | 51.01 |
| 18-5/8" | BTC | 508.00*269.88 | 62.68 |
| 20" | STC | 533.40*228.6 | 43.42 |
| 20" | LTC | 533.4*292.10 | 57.04 |
| 20" | BTC | 533.40*269.88 | 50.10 |
As an experienced API coupling manufacturer and supplier in China, BORUN Steel offers a variety of products, including pup joint, API casing, screen pipe, API tubing, and much more.
Related Names
Thread Coupling for Oil Tubing | Steel Coupling for Oil Casing | Metal Coupling for Oil Well Pipe | Oilfield Drilling Pipe Fitting
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J55 EUE Tubing Couplings to protect the threads in transportation Images
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