Product Main

Specifications

Materials of the Non-magnetic drill collars are from chrome manganese, low carbon obtained by combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.
Magnetic permeability (when MPS=1105/4Nm) relative max μr:1.010.
     
Magnetic field gradient (hot spots) max: B 0.05micro tesla/100mm.
 
Sel.
OD
ID
L mm
  Mm  bending strength ratio
Bending strength ratio
Mm
In
Mm
In
NC21-31
79.4
3 1/8
31.8
1 1/4
9150
76.2
2.57:1
NC26-35
88.9
3 1/2
38.1
1 1/2
9150
82.9
2.42:1
NC31-41
104.8
4 1/8
50.8
2
9150 or 9450
100.4
2.43:1
NC35-47
120.7
4 3/4
50.8
2
9150 or 9450
114.7
2.58:1
NC38-50
127.0
5
57.2
2 1/4
9150 or 9450
121.0
2.38:1
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
NC46-62
158.8
6 1/4
71.4
2 13/16
9150 or 9450
150.0
2.63:1
NC46-65
165.1
6 1/2
57.2
2 1/4
9150 or 9450
154.8
2.76:1
NC46-65
165.1
6 1/2
71.4
2 13/16
9150 or 9450
154.8
3.05:1
NC46-47
171.4
6 3/4
57.2
2 1/4
9150 or 9450
159.5
3.18:1
NC50-67
171.4
6 3/4
71.4
2 13/16
9150 or 9450
159.5
2.37:1
NC50-70
177.8
7
57.2
2 1/4
9150 or 9450
164.7
2.54:1
NC50-70
177.8
7
71.4
2 13/16
9150 or 9450
164.7
2.73:1
NC50-72
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
NC56-80
203.2
8
71.4
2 13/16
9150 or 9450
190.1
3.02:1
6 5/8 REG
209.6
8 1/4
71.4
2 13/16
9150 or 9450
195.7
2.93:1
NC61-90
228.6
9
71.4
2 13/16
9150 or 9450
212.7
3.17:1
7 5/8 REG
241.3
9 1/2
76.2
3
9150 or 9450
223.8
2.81:1
NC70-97
247.6
9 3/4
76.2
3
9150 or 9450
232.6
2.57:1
NC70-100
254.0
10
76.2
3
9150 or 9450
237.3
2.81:1
8 5/8REG
279.4
11
76.2
3
9150 or 9450
266.7
2.84:1
8 5/8REG
355.6
14
76.2
3
9150 or 9450
266.7
2.84:1