British Wrench sizes

BS

3/16

1/4

5/16

3/8

7/16

1/2

9/16

5/8

11/16

3/4

7/8

1

wrench opening

Whit

1/8

3/16

1/4

5/16

3/8

7/16

1/2

9/16

5/8

11/16

3/4

7/8

Bolt Dia.        IN

fract

3/16

1/4

5/16

3/8

7/16

1/2

9/16

5/8

11/16

3/4

7/8

1

Bolt A/F max IN

dec

0.340

0.445

0.525

0.600

0.710

0.820

0.920

1.010

1.100

1.200

1.300

1.480