We supply slick, spiral, and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below,
We can supply other drill collars at customers' request.
Drill Collar Number*
Outside Diameter
Inside Diameter
Length
Approximate Weight
Bevel Diameter
Bending Strength
Ratio
in.
in.
ft±6in
lb./ft.
NC 23-31
3 1/8
1 1/2
30
22
76.2
2.57:1
NC 26-35 (2-3/8 IF)
3 1/2
1 1/2
30
27
82.9
2.42:1
NC 31-41 (2-7/8 IF)
4 1/8
2
30 or 31
34
100.4
2.43:1
NC 35-47
4 3/4
2
30 or 31
47
114.7
2.58:1
NC 38-50 (3-1/2 IF)
5
2 1/4
30 or 31
54
121
2.38:1
NC 44-60
6
2 1/4
30 or 31
83
144.5
2.49:1
NC 44-60
6
2 13/16
30 or 31
76
144.5
2.84:1
NC 44-62
6 1/4
2 1/4
30 or 31
91
149.2
2.91:1
NC 46-62 (4 IF)
6 1/4
2 13/16
30 or 31
84
150
2.63:1
NC 46-65 (4 IF)
6 1/2
2 1/4
30 or 31
100
154.8
2.76:1
NC 46-65 (4 IF)
6 1/2
2 13/16
30 or 31
93
154.8
3.05:1
NC 46-67 (4 IF)
6 3/4
2 1/4
30 or 31
109
159.5
3.18:1
NC 50-70 (4-1/2 IF)
7
2 1/4
30 or 31
118
164.7
2.54:1
NC 50-70 (4-1/2 IF)
7 1/4
2 13/16
30 or 31
111
169.5
2.73:1
NC 50-72 (4-1/2 IF)
7 3/4
2 13/16
30 or 31
120
185.3
3.12:1
NC 56-77
8
2 13/16
30 or 31
140
190.1
2.70:1
NC 56-80
8 1/4
2 13/16
30 or 31
151
195.7
3.02:1
6-5/8 API REG
9
2 13/16
30 or 31
162
212.6
2.93:1
NC 61-90
9 1/2
3
30 or 31
196
223.8
3.17:1
7-5/8 API REG
9 3/4
3
30 or 31
217
232.8
2.81:1
NC 70-97
10
3
30 or 31
230
237.3
2.57:1
NC 70-100
10
3
30 or 31
243
237.3
2.81:1
*The number connection (NC) is an API connection. The first two digits are the pitch diameter of the thread and the last two digits are the outside diameter of the drill collar.
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