Drill collars are essential components in drilling operations, providing weight and stability to the drill string. The following table outlines the key specifications for various standard drill collar models:
| Drill Collar Connection | Drill Collar Diameter (in) | Bore Diameter (in) | Length (ft) | Linear Weight (Approx.) (lb/ft) | Displacement (Open End) (US gal/ft) | Bending Strength Ratio |
| NC 23-31 | 3-1/8 | 1-1/4 | 30 | 22.00 | 0.337 | 2.57:1 |
| NC 26-35 (2-3/8 IF) | 3-1/2 | 1-1/2 | 30 | 26.70 | 0.408 | 2.42:1 |
| NC 31-41 (2-7/8 IF) | 4-1/8 | 2 | 30 or 31 | 33.65 | 0.515 | 2.43:1 |
| NC35-47 | 4-3/4 | 2 | 30 or 31 | 46.81 | 0.716 | 2.58:1 |
| NC 38-50 (3-1/2 IF) | 5 | 2-1/4 | 30 or 31 | 53.29 | 0.815 | 2.38:1 |
| NC 44-60 | 6 | 2-1/4 | 30 or 31 | 82.61 | 1.264 | 2.49:1 |
| NC 44-60 | 6 | 2-13/16 | 30 or 31 | 75.90 | 1.161 | 2.84:1 |
| NC 44-62 | 6-1/4 | 2-1/4 | 30 or 31 | 90.52 | 1.385 | 2.91:1 |
| NC 46 -62 (4IF) | 6-1/4 | 2-13/16 | 30 or 31 | 83.81 | 1.282 | 2.63:1 |
| NC 46 -65 (4IF) | 6-1/2 | 2-1/4 | 30 or 31 | 99.52 | 1.522 | 2.76:1 |
| NC 46-65 (4IF) | 6-1/2 | 2-13/16 | 30 or 31 | 92.81 | 1.420 | 3.05:1 |
| NC 46-67 (4IF) | 6-3/4 | 2-1/4 | 30 or 31 | 108.52 | 1.600 | 3.18:1 |
| NC 50-70 (4IF) | 7 | 2-1/4 | 30 or 31 | 117.52 | 1.798 | 2.54:1 |
| NC 50 -70 (4IF) | 7 | 2-13/16 | 30 or 31 | 110.77 | 1.694 | 2.73:1 |
| NC 50-72 (4IF) | 7-1/4 | 2-13/16 | 30 or 31 | 119.81 | 1.833 | 3.12:1 |
| NC 56-77 | 7-3/4 | 2-13/16 | 30 or 31 | 139.90 | 2.140 | 2.70:1 |
| NC 56-80 | 8 | 2-13/16 | 30 or 31 | 150.81 | 2.307 | 3.02:1 |
| 6-5/8 REG | 8-1/4 | 2-13/16 | 30 or 31 | 161.81 | 2.472 | 2.93:1 |
| NC 61-90 | 9 | 2-13/16 | 30 or 31 | 195.81 | 2.995 | 3.17:1 |
| 7-5/8 REG | 9-1/2 | 3 | 30 or 31 | 217.00 | 3.319 | 2.81:1 |
| NC 70 -97 | 9-3/4 | 3 | 30 or 31 | 230.00 | 3.518 | 2.57:1 |
| NC 70-100 | 10 | 3 | 30 or 31 | 242.97 | 3.717 | 2.81:1 |
| 8-5/8 REG | 11 | 3 | 30 or 31 | 299.00 | 4.574 | 2.84:1 |
| Standard Features |
API Boreback Box Connection API stress relieve groove pin connection Cold Rolling Thread roots Phosphate coated connections |
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| Options |
Spiral grooved or Non-Spiral (Slick Type) Type of Hardband and Hardband configuration Elevator and Slip recesses or Slip Recess only Other type of connections to meet specific needs |
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| Protection |
Standard Pressed Steel Thread Protectors. Cast Steel Lifting Bail Thread Protectors upon request. |
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| Mill Test Certificates |
Issued in accordance with API 7/7-1 and API RP7G specifications. Third Party Inspection can be performed on request at buyer’s care and expense. |
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