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We offer a wide variety of drill collars according to API Spec 7 directly from our partner manufacturer in China.
Normal drill collars provide weight and tension on the drill bit and keep it centralized. Spiral drill collars effectively reduce the contact area with the drill hole thus avoiding the drill bit getting stuck.
| Drill Collar Thread | OD | ID | Length (mm) |
Bevel Diameter | Bending Ratio | ||
|---|---|---|---|---|---|---|---|
| (mm) | (in) | (mm) | (in) | ||||
| NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/2 | 9150 | 76.2 | 2.57:1 |
| NC26-35(2 3/8 IF) | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42:1 |
| NC31-41(2 7/8 IF) | 104.8 | 4 1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
| NC35-47 | 120.6 | 4 3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
| NC38-50(3 1/2 IF) | 127.0 | 5 | 57.2 | 2 1/4 | 9150 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150&9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150&9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150&9450 | 149.2 | 2.91:1 |
| NC46-62(4IF) | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150&9450 | 150.0 | 2.63:1 |
| NC46-65(4IF) | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150&9450 | 154.8 | 2.76:1 |
| NC46-65(4IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150&9450 | 154.8 | 3.05:1 |
| NC46-67(4IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150&9450 | 159.5 | 3.18:1 |
| NC50-67(4 1/2 IF) | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150&9450 | 159.5 | 2.37:1 |
| NC50-70(4 1/2 IF) | 177.8 | 7 | 57.2 | 2 1/4 | 9150&9450 | 164.7 | 2.54:1 |
| NC50-70(4 1/2 IF) | 177.8 | 7 | 71.4 | 2 13/16 | 9150&9450 | 164.7 | 2.73:1 |
| NC50-72(4 1/2 IF) | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150&9450 | 169.5 | 3.12:1 |
| NC56-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150&9450 | 185.3 | 2.70:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150&9450 | 190.1 | 3.02:1 |
| 6 5/8 REG | 209.6 | 8 1/4 | 71.4 | 2 13/16 | 9150&9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150&9450 | 212.6 | 3.17:1 |
| 7 5/8 REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150&9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 9 3/4 | 76.2 | 3 | 9150&9450 | 232.8 | 2.57:1 |
| NC70-100 | 254 | 10 | 76.2 | 3 | 9150&9450 | 237.3 | 2.81:1 |
| 8 5/8 REG | 279.4 | 11 | 76.2 | 3 | 9150&9450 | 266.7 | 2.84:1 |
| Drill Collar OD | Cutting depth | Lead +/- 25.4 | ||
|---|---|---|---|---|
| (mm) | (in) | A (mm) | B (mm) | (mm) |
| 86 | 3 3/8 | 3.5 +- 0.79 | 679 | |
| 98.4 | 3 7/8 | 4.0 +- 0.79 | 914 | |
| 101.6~111.1 | 4~4 1/8 | 4.8 +- 0.79 | 914 | |
| 114.3~130.2 | 4 1/2~5 1/8 | 5.6 +- 0.79 | 965 | |
| 133.4~146.1 | 5 1/4~5 3/4 | 6.4 +- 0.79 | 1067 | |
| 149.2~161.9 | 5 7/8~6 3/8 | 7.1 +- 1.59 | 1067 | |
| 165.1~177.8 | 6 1/2~7 | 7.9 +- 1.59 | 1168 | |
| 181.0~200.0 | 7 1/8~7 7/8 | 8.7 +- 1.59 | 5.6 +- 0.79 | 1626 |
| 203.2~225.4 | 8~8 7/8 | 9.5 +- 1.59 | 6.4 +- 0.79 | 1727 |
| 228.6~250.8 | 9~9 7/8 | 10.3 +- 2.37 | 7.1 +- 1.59 | 1829 |
| 254.0~276.2 | 10~10 7/8 | 11.1 +- 2.37 | 7.9 +- 1.59 | 1930 |
| 279.4 | 11 | 11.9 +- 2.37 | 8.7 +- 1.59 | 2032 |