Drill Collars

We offer a wide variety of drill collars according to API Spec 7 directly from our partner manufacturer in China.
Normal drill collars provide weight and tension on the drill bit and keep it centralized. Spiral drill collars effectively reduce the contact area with the drill hole thus avoiding the drill bit getting stuck.

Normal Drill Collar Specifications

Drill Collar Thread OD ID Length
(mm)
Bevel Diameter Bending Ratio
(mm) (in) (mm) (in)
NC23-31 79.4 3 1/8 31.8 1 1/2 9150 76.2 2.57:1
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 7/8 IF) 104.8 4 1/8 50.8 2 9150 100.4 2.43:1
NC35-47 120.6 4 3/4 50.8 2 9150 114.7 2.58:1
NC38-50(3 1/2 IF) 127.0 5 57.2 2 1/4 9150 121.0 2.38:1
NC44-60 152.4 6 57.2 2 1/4 9150&9450 144.5 2.49:1
NC44-60 152.4 6 71.4 2 13/16 9150&9450 144.5 2.84:1
NC44-62 158.8 6 1/4 57.2 2 1/4 9150&9450 149.2 2.91:1
NC46-62(4IF) 158.8 6 1/4 71.4 2 13/16 9150&9450 150.0 2.63:1
NC46-65(4IF) 165.1 6 1/2 57.2 2 1/4 9150&9450 154.8 2.76:1
NC46-65(4IF) 165.1 6 1/2 71.4 2 13/16 9150&9450 154.8 3.05:1
NC46-67(4IF) 171.4 6 3/4 57.2 2 1/4 9150&9450 159.5 3.18:1
NC50-67(4 1/2 IF) 171.4 6 3/4 71.4 2 13/16 9150&9450 159.5 2.37:1
NC50-70(4 1/2 IF) 177.8 7 57.2 2 1/4 9150&9450 164.7 2.54:1
NC50-70(4 1/2 IF) 177.8 7 71.4 2 13/16 9150&9450 164.7 2.73:1
NC50-72(4 1/2 IF) 184.2 7 1/4 71.4 2 13/16 9150&9450 169.5 3.12:1
NC56-77 196.8 7 3/4 71.4 2 13/16 9150&9450 185.3 2.70:1
NC56-80 203.2 8 71.4 2 13/16 9150&9450 190.1 3.02:1
6 5/8 REG 209.6 8 1/4 71.4 2 13/16 9150&9450 195.7 2.93:1
NC61-90 228.6 9 71.4 2 13/16 9150&9450 212.6 3.17:1
7 5/8 REG 241.3 9 1/2 76.2 3 9150&9450 223.8 2.81:1
NC70-97 247.6 9 3/4 76.2 3 9150&9450 232.8 2.57:1
NC70-100 254 10 76.2 3 9150&9450 237.3 2.81:1
8 5/8 REG 279.4 11 76.2 3 9150&9450 266.7 2.84:1

Spiral Drill Collar Specifications

Drill Collar OD Cutting depth Lead +/- 25.4
(mm) (in) A (mm) B (mm) (mm)
86 3 3/8 3.5 +- 0.79
679
98.4 3 7/8 4.0 +- 0.79   914
101.6~111.1 4~4 1/8 4.8 +- 0.79   914
114.3~130.2 4 1/2~5 1/8 5.6 +- 0.79   965
133.4~146.1 5 1/4~5 3/4 6.4 +- 0.79   1067
149.2~161.9 5 7/8~6 3/8 7.1 +- 1.59   1067
165.1~177.8 6 1/2~7 7.9 +- 1.59   1168
181.0~200.0 7 1/8~7 7/8 8.7 +- 1.59 5.6 +- 0.79 1626
203.2~225.4 8~8 7/8 9.5 +- 1.59 6.4 +- 0.79 1727
228.6~250.8 9~9 7/8 10.3 +- 2.37 7.1 +- 1.59 1829
254.0~276.2 10~10 7/8 11.1 +- 2.37 7.9 +- 1.59 1930
279.4 11 11.9 +- 2.37 8.7 +- 1.59 2032
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