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Kelly

Brief Introduction:

Kelly is the drive part of whole drill string, it transmits the torque from rotary table to the bit in the bottom hole.

Kelly is manufactured strictly according to API Spec7-1 standard.

• Ends and drive sections, IDs and connections machined and inspected to API specifications.

• Kelly bars are ultrasonically inspected over full length and section.

Item

Name

Standard

Size

Upper box connection(LH)

Lower pin connection

Drive

Overall length

Connection

O.D in

Bevel diameter mm

Upset length

Connection

OD. in

ID.

Bevel diameter mm

Upset length

Section length

in

　

±0.8

±0.4

in

　

　

±0.8

in

±0.4

in

ft

ft

1

Square Kelly

Standard

2.1/2

6.5/8"REG

7.3/4

186.1

16

NC26

2.3/8"IF

3.3/8

1.1/4

83

20

37

40

2

Square Kelly

Optional

2.1/2

4.1/2"REG

5.3/4

134.5

16

NC26

2.3/8"IF

3.3/8

1.1/4

83

20

37

40

3

Square Kelly

Standard

3

6.5/8"REG

7.3/4

186.1

16

NC31

2.7/8"IF

4.1/8

1.3/4

100.4

20

37

40

4

Square Kelly

Optional

3

4.1/2"REG

5.3/4

134.5

16

NC31

2.7/8"IF

4.1/8

1.3/4

100.4

20

37

40

5

Square Kelly

Standard

3.1/2

6.5/8"REG

7.3/4

186.1

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

37

40

6

Square Kelly

Optional

3.1/2

4.1/2"REG

5.3/4

134.5

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

37

40

7

Square Kelly

Standard

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC46

4"IF

6.1/4

2.13/16

145.2

20

37

40

8

Square Kelly

Standard

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC50

4.1/2"IF

6.3/8

2.13/16

154

20

37

40

9

Square Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC46

4"IF

6.1/4

2.13/16

145.2

20

37

40

10

Square Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC50

4.1/2"IF

6.3/8

2.13/16

154

20

37

40

11

Square Kelly

Standard

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC46

4"IF

6.1/4

2.13/16

145.2

20

51

54

12

Square Kelly

Standard

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC50

4.1/2"IF

6.3/8

2.13/16

154

20

51

54

13

Square Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC46

4"IF

6.1/4

2.13/16

145.2

20

51

54

14

Square Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC50

4.1/2"IF

6.3/8

2.13/16

154

20

51

54

15

Square Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

5.1/2"FH

7

3.1/4

170.6

20

37

40

16

Square Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC56

7

3.1/4

171

20

37

40

17

Square Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

5.1/2"FH

7

3.1/4

170.6

20

51

54

18

Square Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC56

7

3.1/4

171

20

51

54

19

Hex Kelly

Standard

3

6.5/8"REG

7.3/4

186.1

16

NC26

2.3/8"IF

3.3/8

1.1/4

82.9

20

37

40

20

Hex Kelly

Optional

3

4.1/2"REG

5.3/4

134.5

16

NC26

2.3/8"IF

3.3/8

1.1/4

82.9

20

37

40

21

Hex Kelly

Standard

3.1/2

6.5/8"REG

7.3/4

186.1

16

NC31

2.7/8"IF

4.1/8

1.3/4

100.4

20

37

40

22

Hex Kelly

Optional

3.1/2

4.1/2"REG

5.3/4

134.5

16

NC31

2.7/8"IF

4.1/8

1.3/4

100.4

20

37

40

23

Hex Kelly

Standard

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

37

40

24

Hex Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

37

40

25

Hex Kelly

Optional

4.1/4

6.5/8"REG

7.3/4

186.1

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

51

54

26

Hex Kelly

Optional

4.1/4

4.1/2"REG

5.3/4

134.5

16

NC38

3.1/2"IF

4.3/4

2.1/4

116.3

20

51

54

27

Hex Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC46

4"IF

6.1/4

3

145.2

20

37

40

28

Hex Kelly

Standard

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC50

4.1/2"IF

6.3/8

3.1/4

154

20

37

40

29

Hex Kelly

Optional

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC46

4"IF

6.1/4

3

145.2

20

51

54

30

Hex Kelly

Optional

5.1/4

6.5/8"REG

7.3/4

186.1

16

NC50

4.1/2"IF

6.3/8

3.1/4

154

20

51

54

31

Hex Kelly

Standard

6

6.5/8"REG

7.3/4

186.1

16

5.1/2"FH

7

3.1/2

170.6

20

37

40

32

Hex Kelly

Standard

6

6.5/8"REG

7.3/4

186.1

16

NC56

7

3.1/2

171

20

37

40

33

Hex Kelly

Standard

6

6.5/8"REG

7.3/4

186.1

16

5.1/2"FH

7

3.1/2

170.6

20

51

54

34

Hex Kelly

Standard

6

6.5/8"REG

7.3/4

186.1

16

NC56

7

3.1/2

171

20

51

54

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