Drill Collar

Drill Collar Model

D

d

L(mm)

DF(mm)

Bending Strength ratio

Drill Collar
Nominal size

mm

In

mm

in

JD-DC3-1/8

79.4

3-1/8

31.8

1-1/2

9,150

76.2

2.57:1

NC23-31

JD-DC 3-1/2

88.9

3-1/2

38.1

1-1/2

9,150

82.9

2.42:1

NC26-35(2-3/8IF)

JD-DC 4-1/8

104.8

4-1/8

50.8

2

9,150

100.4

2.43:1

NC31-41(2-7/8IF)

JD-DC 4-3/4

120.7

4-3/4

50.8

2

9,150

114.7

2.58:1

NC35-47

JD-DC 5

127

5

57.2

2-1/4

9,150

121

2.38:1

NC38-50(3-1/2IF)

JD-DC 6A

152.4

6

57.2

2-1/4

9,150/9,450

144.5

2.49:1

NC44-60

JD-DC 6B

152.4

6

71.4

2-13/16

9,150/9450

144.5

2.84:1

NC44-60

JD-DC 6-1/4A

158.8

6-1/4

57.2

2-1/4

9,150/9,450

149.2

2.91:1

NC44-62

JD-DC 6-1/4B

158.8

6-1/4

71.4

2-13/16

9,150/9,450

150

2.63:1

NC46-62(4IF)

JD-DC 6-1/2A

165.1

6-1/2

57.2

2-1/4

9,150/9,450

154.8

2.76:1

NC46-65(4IF)

JD-DC 6-1/2B

165.1

6-1/2

71.4

2-13/16

9,150/9,450

154.8

3.05:1

NC46-65(4IF)

JD-DC 6-3/4A

171.4

6-3/4

57.2

2-1/4

9,150/9,450

159.5

3.18:1

NC46-67(4IF)

JD-DC 6-3/4B

171.4

6-3/4

71.4

2-13/16

9,150/9,450

159.5

2.37:1

NC50-67(4-1/2IF)

JD-DC 7A

177.8

7

57.2

2-1/4

9,150/9,450

164.7

2.54:1

NC50-70(4-1/2IF)

JD-DC 7B

177.8

7

71.4

2-13/16

9,150/9,450

164.7

2.73:1

NC50-70(4-1/2IF)

JD-DC 7-1/4

184.2

7-1/4

71.4

2-13/16

9,150/9,450

169.5

3.12:1

NC50-72(4-1/2IF)

JD-DC 7-3/4

196.8

7-3/4

71.4

2-13/16

9,150/9,450

185.3

2.70:1

NC56-77

JD-DC 8

203.2

8

71.4

2-13/16

9,150/9,450

190.1

3.02:1

NC56-80

JD-DC 8-1/4

209.6

8-1/4

71.4

2-13/16

9,150/9,450

195.7

2.93:1

6-5/8REG

JD-DC 9

228.6

9

71.4

2-13/16

9,150/9,450

212.7

3.17:1

NC61-90

JD-DC 9-1/2

241.3

9-1/2

76.2

3

9,150/9,450

223.8

2.81:1

7-5/8REG

JD-DC 9-3/4

247.6

9-3/4

76.2

3

9,150/9,450

232.6

2.57:1

NC70-97

JD-DC 10

254

10

76.2

3

9,150/9,450

237.3

2.81:1

NC70-100

JD-DC 11

279.4

11

76.2

3

9,150/9,450

266.7

2.84:1

8-5/8 REG