Kelly /square kelly /drill string

Standard O.D.(in)

Optional O.D.(in)

Square O.D.(in)

Hex. O.D.(in)

Square

Hex.

A

B

2-1/2

6-5/8REG     7-3/4

4-1/2REG    5-3/4

NC26    85.7

1-1/4

3-2/7

3

6-5/8 REG    7-3/4

4-1/2REG    5-3/4

NC31    4-1/8

NC26    3-3/8

1-3/4

1-1/4

4

3-3/8

3-1/2

6-5/8 REG    7-3/4

4-1/2REG    5-3/4

NC38  4-3/4

NC31    4-1/8

2-1/4

1-3/4

4-1/2

4

4-1/4

6-5/8REG    7-3/4

4-1/2REG    5-3/4

NC46  6-1/4

NC38    4-3/4

2-4/5

2-1/4

5-4/7

4-4/5

6-5/8 REG    7-3/4

4-1/2REG    5-3/4

NC50  6-3/8

NC38    4-3/4

2-4/5

2-1/4

5-4/7

4-4/5

5-1/4

6-5/8 REG    7-3/4

5-1/2FH 7

NC46    6-1/4

3-1/4

3

7

6

6-5/8 REG    7-3/4

NC56     7

NC50    6-3/8

3-1/4

3-1/4

7

6

6

6-5/8 REG    7-3/4

5-1/2FH    7

3-1/2

6-4/5

6-5/8 REG    7-3/4

NC56      7

3-1/2

6-4/5