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Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition.
Alternative surface finishes are available.
Standard Size for Drill Collars | |||||||
Drill collar number and connection |
Outside Diameter |
Inside Diameter |
Length mm |
Bevel Diameter |
Ref. Bending strength |
||
mm |
in |
mm |
in |
||||
NC23 – 31 |
79.4 |
3 1/8 |
31.8 |
1- 1/4 |
9150 |
76.2 |
2.57:1 |
NC35-7 |
120.7 |
4 3/4 |
50.8 |
2 |
9150 |
114.7 |
2.58:1 |
NC44-60 |
152.4 |
6 |
57.2 |
2- 1/4 |
9150 or 9450 |
144.5 |
2.49:1 |
NC44-60 |
152.4 |
6 |
71.4 |
2- 13/16 |
9150 or 9450 |
144.5 |
2.84:1 |
NC44-62 |
158.8 |
6 1/4 |
57.2 |
2- 1/4 |
9150 or 9450 |
149.2 |
2.91:1 |
NC46-65(4 IF) |
165.1 |
6 1/2 |
57.2 |
2- 1/4 |
9150 or 9450 |
154.8 |
2.76:1 |
NC56-80 |
203.2 |
8 |
71.4 |
2- 13/16 |
9150 or 9450 |
190.1 |
3.02:1 |
6 5/8REG |
209.6 |
8 1/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
195.7 |
2.93:1 |
NC70-97 |
247.6 |
9 3/4 |
76.2 |
3 |
9150 or 9450 |
232.6 |
2.57:1 |
8 5/8REG |
279.4 |
11 |
76.2 |
3 |
9150 or 9450 |
266.7 |
2.84:1 |
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