Shaft 

Diameter

Part Number

A

Pilot 

 Diamete

B

Distance 

Between Bolt Holes

L

Mounting 

Surface to 

Collar Face

C

D

F

Bolts

H

J

K

M

P

U

Y

Approx. 

 Weight

Square

Circle

1 7/16

FCB22623H

3.625

3 3/32

4 3/8

1 17/64

5 1/4

2.71

3/8

1/2

1 3/8

2 3/16

2 1/4

29/64

3/4

1 7/8

6.00

1 15/16

FCB22631H

4.500

3 51/64

5 3/8

1 31/64

6 3/8

3.08

7/16

9/16

1 9/16

2 7/16

2 31/32

39/64

7/8

1 29/32

9.00

2 3/16

FCB22635H

5.000

4 1/4

6

1 1/2

7 1/8

3.16

1/2

9/16

1 9/16

2 1/2

3 5/32

5/8

1

2 1/32

12.00

2 7/16

FCB22639H

5.500

4 19/32

6 1/2

1 19/32

7 5/8

3.28

1/2

5/8

1 11/16

2 5/8

3 5/8

41/64

1

2 5/32

16.00

2 11/16

FCB22643H

6.375

5 19/64

7 1/2

1 53/64

8 3/4

3.86

5/8

3/4

2

3 1/8

4 5/32

45/64

1 1/4

2 5/16

25.00

2 15/16

FCB22647H

24.00

3 7/16

FCB22655H

7.375

6 3/32

8 5/8

2 25/64

10 1/4

4.29

3/4

15/16

2

3 7/16

4 15/16

57/64

1 1/4

2 25/32

37.00

3 15/16

FCB22663H

8.125

6 5/8

9 3/8

2 17/32

10 7/8

4.94

3/4

1 1/8

2 1/2

4 1/8

5 7/16

59/64

2

3 1/16

50.00