Shaft 

Diameter

Fixed

Expansion

A

B

Distance 

Between 

Bolt Holes

C

D

F

Bolts

G

H

J

K

L

Mounting 

Surface to 

Collar Face

M

P

X

Approx. 

Weight

Part Number

Part Number

Square

Circle

1-7/16

EFB-107-T

EFB-107-TE

3.81

3.50

4.95

4.62

2.71

1/2

0.53

1.06

3.50

0.69

3.24

2.30

1.00

0.23

5.24

1-11/16

EFB-111-T

EFB-111-TE

4.00

4.12

5.83

5.37

2.76

1/2

0.72

1.19

3.75

0.46

3.48

2.58

1.00

0.22

6.83

1-15/16

EFB-115-T

EFB-115-TE

4.25

4.38

6.19

5.62

2.84

1/2

0.78

1.18

3.89

0.55

3.62

2.88

1.09

0.26

7.86

2-3/16

EFB-203-T

EFB-203-TE

4.60

4.87

6.89

6.25

2.99

5/8

0.93

1.38

4.20

0.46

3.93

3.25

1.15

0.26

9.75

2-7/16

EFB-207-T

EFB-207-TE

5.63

5.37

7.60

6.87

3.55

5/8

0.98

1.50

4.80

0.59

4.53

3.55

1.29

0.34

15.07

2-1/2

EFB-208-T

EFB-208-TE

2-11/16

EFB-211-T

EFB-211-TE

6.10

6.00

8.49

7.75

3.65

3/4

1.09

1.61

5.01

0.48

4.74

4.04

1.33

0.34

20.74

2-15/16

EFB-215-T

EFB-215-TE

3-7/16

EFB-307-T

EFB-307-TE

7.48

7.00

9.90

9.25

4.12

3/4

1.24

1.87

5.64

0.34

5.36

4.90

1.40

0.34

30.98

3-1/2

EFB-308-T

EFB-308-TE

3-15/16

EFB-315-T

EFB-315-TE

8.22

7.75

10.96

10.25

4.64

7/8

1.99

2.12

6.70

0.23

6.63

5.63

1.61

0.34

43.90