English

Metric

Continental

American

English

Metric

Continental

American

J

48.60mm

-

4¾

R½

59.21mm

19

8¾

J½

49.20mm

9

5

S

59.85mm

20

9

K

49.80mm

10

5¼

S½

60.48mm

-

9¼

K½

50.40mm

-

5½

T

61.12mm

21

9½

L

51.00mm

11

5¾

T½

61.76mm

22

9¾

L½

51.60mm

-

6

U

62.40mm

-

10

M

52.20mm

12

6¼

U½

63.04mm

23

10¼

M½

52.80mm

13

6½

V

63.68mm

24

10½

N

53.46mm

-

6¾

V½

64.31mm

-

10¾

N½

54.10mm

14

7

W

64.87mm

25

11

O

54.75mm

15

7

W½

65.47mm

-

11¼

O½

55.40mm

-

7¼

X

66.07mm

26

11½

P

56.00mm

16

7½

X½

66.67mm

-

11¾

P½

56.65mm

-

7¾

Y

67.27mm

-

12

Q

57.30mm

17

8

Y½

67.86mm

-

12¼

Q½

57.94mm

18

8¼

Z

68.46mm

-

12½

R

58.57mm

-

8½

Z½

69.20mm

-

12¾