Drill
Collar Number and Connection Label
OD mm
ID mm
Length m
BD mm
Referenced
bending Strength Ratio
+1.59
±152.4mm
NC23-31
79.4
31.8
9.14
76.2
2.57:1
NC26-35
88.9
38.1
9.14
82.9
2.42:1
NC31-41
104.8
50.8
9.14
/ 9.45
100.4
2.43:1
NC35-47
120.6
50.8
9.14
/ 9.45
114.7
2.58:1
NC38-50
127.0
57.2
9.14
/ 9.45
121
2.38;1
NC44-60
152.4
57.2
9.14
/ 9.45
144.5
2.49:1
NC44-60
152.4
71.4
9.14
/ 9.45
144.5
2.84:1
NC44-62
158.8
57.2
9.14
/ 9.45
149.2
2.91:1
NC46-62
158.8
71.4
9.14
/ 9.45
150
2.63:1
NC46-65
165.1
57.2
9.14
/ 9.45
154.8
2.76:1
NC46-65
165.1
71.4
9.14
/ 9.45
154.8
3.05:1
NC46-67
171.4
57.2
9.14
/ 9.45
159.5
3.18:1
NC50-70
177.8
57.2
9.14
/ 9.45
164.7
2.54:1
NC50-70
177.8
71.4
9.14
/ 9.45
164.7
2.73:1
NC50-72
184.2
71.4
9.14
/ 9.45
169.5
3.12:1
NC56-77
196.8
71.4
9.14
/ 9.45
185.3
2.70:1
NC56-80
203.2
71.4
9.14
/ 9.45
190.1
3.02:1
65/8 REG
209.6
71.4
9.14
/ 9.45
195.6
2.93:1
NC61-90
228.6
71.4
9.14
/ 9.45
212.7
3.17:1
75/8 REG
241.3
76.2
9.14
/ 9.45
223.8
2.81:1
NC70-97
247.6
76.2
9.14
/ 9.45
232.6
2.57:1
NC70-100
254.0
76.2
9.14
/ 9.45
237.3
2.81:1
85/8 REG
279.4
76.2
9.14
/ 9.45
266.7
2.84:1
SHAANXI KERGY MECHANICAL EQUIPMENT CO.,LTD
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