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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.

slick drill collar, spiral drill collar, non-magnetic drill collar

  Drill Collar Specifications (API 7-1)

Drill Collor Number*
Outside Diameter,
in.
Inside Diameter,
in.
Length,
ft
Approximate Weight,
lb/ft
Typical Bending
Strength Ratio
NC 23-31
3-1/8
1-1/4
30
22
2.57:1
NC 26-35 (2-3/8 IF)
3-1/2
1-1/2
30
27
2.42:1
NC 31-41 (2-7/8 IF)
4-1/8
2
30 or 31
34
2.43:1
NC 35-47
4-3/4
2
30 or 31
47
2.58:1
NC 38-50 (3-1/2 IF)
5
2-1/4
30 or 31
54
2.38:1
NC 44-60
6
2-1/4
30 or 31
83
2.49:1
NC 44-60
6
2-13/16
30 or 31
76
2.84:1
NC 44-62
6-1/4
2-1/4
30 or 31
91
2.91:1
NC 46-62 (4 IF)
6-1/4
2-13/16
30 or 31
84
2.63:1
NC 46-65 (4 IF)
6-1/2
2-1/4
30 or 31
100
2.76:1
NC 46-65 (4 IF)
6-1/2
2-13/16
30 or 31
93
3.05:1
NC 46-67 (4 IF)
6-3/4
2-1/4
30 or 31
109
3.18:1
NC 50-70 (4-1/2 IF)
7
2-1/4
30 or 31
118
2.54:1
NC 50-70 (4-1/2 IF)
7
2-13 /16
30 or 31
111
2.73:1
NC 50-72 (4-1/2 IF)
7-1/4
2-13/16
30 or 31
120
3.12:1
NC 56-77
7-3 /4
2-13/16
30 or 31
140
2.70:1
NC 56-80
8
2-13/16
30 or 31
151
3.02:1
6-5/8 API Reg
8-1/4
2-13/16
30 or 31
162
2.93:1
NC 61-90
9
2-13/16
30 or 31
196
3.17:1
7-5/8 API Reg
9-1/2
3
30 or 31
217
2.81:1
NC 70-97
9-3/4
3
30 or 31
230
2.57:1
NC 70-100
10
3
30 or 31
243
2.81:1
8-5/8 API Reg
11
3
30 or 31
300
2.84:1

*The number connection (NC ) is an API connection with the V- .065 thread form with a V- .038R thread root radius. 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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