Bit Sub with Float Bore API Pin Stress Relief Groove and Box Boreback



Bit Sub with Float Bore API Pin Stress Relief Groove and Box Boreback 

Forwell can supply a range drilling equipment and supplies including Kelly Saver, Tool Joint, Crossover, Bit, Drill Collar, and Swivel Drilling Subs.

Specification as follows:

Items No.

Code

Thread Connection

Thread Form

Pin Thread

Box Thread

Rd/In

Taper

DS

DF

Thread Length

QF

Thread Length

1


NC23

4

1:6

65.10

52.4

76.2

66.7

92.1

2

2A10

NC26(23/8"IF)

4

1:6

73.05

60.35

76.2

74.6

92.1

3

210

NC31(27/8"IF)

4

1:6

86.13

71.32

88.9

87.7

104.8

4


NC35

4

1:6

94.97

79.09

95.2

96.8

111.1

5

310

NC38(31/2"IF)

4

1:6

102.01

85.07

101.6

103.6

117.5

6

4A20

NC40(4"FH)

4

1:6

108.71

89.66

114.3

110.3

130.2

7


NC44

4

1:6

117.48

98.43

114.3

119.1

130.2

8

4A10

NC46(4"IF)

4

1:6

122.78

103.73

114.3

124.6

130.2

9

410

NC50(41/2"IF)

4

1:6

133.35

114.3

114.3

134.9

130.2

10


NC56

4

1:4

149.25

117.5

127

150.8

142.9

11


NC61

4

1:4

163.53

126.6

139.7

165.1

155.6

12


NC70

4

1:4

185.75

147.65

152.4

187.3

168.3

13


NC77

4

1:4

203.20

161.85

165.1

204.8

181

14

2A30

23/8"REG

5

1:4

66.68

47.63

76.2

69.3

92.1

15

230

27/8"RED

5

1:4

76.20

53.98

88.9

77.8

104.8

16

330

31/2"RED

5

1:4

88.90

65.08 

95.2

90.5

111.1

17

430

41/2"RED

5

1:4

117.48

90.48

107.9

119.1

123.8

18

530

51/2"RED

4

1:4

140.21

110.06

120.6

141.7

136.5



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