OD in

ID in

L ft.

Bevel Dia.

mm

Drill Collar Threads

Ref. Bend Strength Ratio

3-1/8

1-1/2

30

76.2

NC23-31

2.57:1

3-1/2

1-1/2

30

82.9

NC26-35(2-3/8IF)

2.42:1

4-1/8

2

30

100.4

NC31-41(2-7/8IF)

2.43:1

4-3/4

2

30

114.7

NC35-47

2.58:1

5

2-1/4

30

121

NC38-50(3-1/2IF)

2.38:1

6

2-1/4

30 or 31

144.5

NC44-60

2.49:1

6

2-13/16

30 or 31

144.5

NC44-60

2.84:1

6-1/4

2-1/4

30 or 31

149.2

NC44-62

2.91:1

6-1/4

2-13/16

30 or 31

150

NC46-62(4IF)

2.63:1

6-1/2

2-1/4

30 or 31

154.8

NC46-65(4IF)

2.76:1

6-1/2

2-13/16

30 or 31

154.8

NC46-65(4IF)

3.05:1

6-3/4

2-1/4

30 or 31

159.5

NC46-67(4IF)

3.18:1

6-3/4

2-13/16

30 or 31

159.5

NC50-67(4-1/2IF)

2.37:1

7

2-1/4

30 or 31

164.7

NC50-70(4-1/2IF)

2.54:1

7

2-13/16

30 or 31

164.7

NC50-70(4-1/2IF)

2.73:1

7-1/4

2-13/16

30 or 31

169.5

NC50-72(4-1/2IF)

3.12:1

7-3/4

2-13/16

30 or 31

185.3

NC56-77

2.70:1

8

2-13/16

30 or 31

190.1

NC56-80

3.02:1

8-1/4

2-13/16

30 or 31

195.7

6-5/8REG

2.93:1

9

2-13/16

30 or 31

212.7

NC61-90

3.17:1

9-1/2

3

30 or 31

223.8

7-5/8REG

2.81:1

9-3/4

3

30 or 31

232.6

NC70-97

2.57:1

10

3

30 or 31

237.3

NC70-100

2.81:1

11

3

30 or 31

266.7

8-5/8 REG

2.84:1