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By certification 
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 |
||||
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 7/8IF) |
104.8 |
4 1/8 |
50.8 |
2 |
9150 |
100.4 |
2.43:1 |
NC46-62 (4 IF) |
158.8 |
6 1/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
150.0 |
2.63:1 |
NC46-65 (4 IF) |
165.1 |
6 1/2 |
71.4 |
2- 13/16 |
9150 or 9450 |
154.8 |
3.05:1 |
NC46-67 (4 IF) |
171.4 |
6 3/4 |
57.2 |
2- 1/4 |
9150 or 9450 |
159.5 |
3.18:1 |
NC50-67 (4 1/2 IF) |
171.4 |
6 3/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
159.5 |
2.37:1 |
NC50-72 (4 1/2 IF) |
184.2 |
7 1/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
169.5 |
3.12:1 |
NC56-77 |
196.8 |
7 3/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
185.3 |
2.70:1 |
6 5/8 REG |
209.6 |
8 1/4 |
71.4 |
2- 13/16 |
9150 or 9450 |
195.7 |
2.93:1 |
7 5/8REG |
241.3 |
9 1/2 |
76.2 |
3 |
9150 or 9450 |
223.8 |
2.81:1 |
NC70-100 |
254.0 |
10 |
76.2 |
3 |
9150 or 9450 |
237.3 |
2.81:1 |
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