The API metal 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 |
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API Metal Couplings for Oil Well Casings and tubings Images
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