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Rod size

OD of pin

OD of shoulder&box

OD of coupling

L of pin

Min L of wrench square

Widths of wrench square rods

Widths of flat square couplings

L of couplings

5/8

15/16

1-3/8

1-1/2

1-1/8

1-1/4

7/8

1-3/8

4

3/4

1-1/16

1-1/2

1-5/8

1-3/8

1-1/4

1

1-1/2

4

7/8

1-3/16

1-5/8

1-13/16

1-3/8

1-1/4

1

1-5/8

4

1

1-3/8

2

2-3/16

1-3/4

1-1/2

1-5/16

1-7/8

4

1-1/8

1-9/16

2-1/4

2-3/8

2

1-5/8

1-1/2

2-1/8

4-1/2