US Size

Dia. -inch

Dia. in MM

Metric -MM

British / Australia

French

German

Japanese

Swiss

2

0.52

13.21

41.5

D

41 1/2

13 1/2

2

1 1/2

2 1/4

-

13.41

42.1

D 1/2

-

-

2 1/2

0.536

13.61

42.7

E

42 3/4

13 3/4

3

2 3/4

2 3/4

-

13.83

43.4

E 1/2

-

-

3

0.553

14.05

44

F

44

14

4

4

3 1/8

-

14.15

44.3

F 1/2

-

-

3 1/4

-

14.25

44.6

-

-

-

3 3/8

-

14.36

44.9

G

45 1/4

-

5

5 1/4

3 1/2

0.569

14.45

45.2

-

-

14 1/2

3 5/8

-

14.56

45.6

G 1/2

-

6

3 3/4

-

14.65

45.9

H

46 1/2

6 1/2

4

0.585

14.86

46.5

H 1/2

-

15

7

4 1/4

-

15.04

47.1

I

47 3/4

7 3/4

4 1/2

0.601

15.27

47.8

I 1/2

-

15 1/4

8

4 5/8

-

15.4

48.1

J

49

15 1/2

9

4 3/4

-

15.53

48.4

-

-

5

0.618

15.7

49

J 1/2

-

15 3/4

9

5 1/8

-

15.8

49.3

K

50

10

5 1/4

-

15.9

49.6

-

-

5 3/8

-

16

50

K 1/2

-

10

5 1/2

0.634

16.1

50.3

L

51 3/4

16

11 3/4

5 3/4

-

16.3

50.9

-

-

5 7/8

-

16.41

51.3

L 1/2

-

6

0.65

16.51

51.5

M

52 3/4

16 1/2

12

12 3/4

6 1/4

-

16.71

52.2

M 1/2

-

6 1/2

0.666

16.92

52.8

N

54

17

13

14

6 3/4

-

17.13

53.4

N 1/2

-

7

0.683

17.35

54

O

55 1/4

17 1/4

14

15 1/4

7 1/4

-

17.45

54.7

O 1/2

-

7 1/2

0.699

17.75

55.3

P

56 1/2

17 3/4

15

16 1/2

7 3/4

-

17.97

55.9

P 1/2

-

8

0.716

18.19

56.6

Q

57 3/4

18

16

17 3/4

8 1/4

-

18.35

57.2

Q 1/2

-

8 1/2

0.732

18.53

57.8

-

-

18 1/2

17

8 5/8

-

18.61

58.4

R

59

19

8 3/4

-

18.69

58.4

-

-

8 7/8

-

18.8

59

R 1/2

-

9

0.748

18.89

59.1

-

-

19

18

9 1/8

-

19.1

59.4

S

60 1/4

20 1/4

9 1/4

-

19.22

59.7

-

-

9 3/8

-

19.31

60

S 1/2

-

9 1/2

0.764

19.41

60.3

-

-

19 1/2

19

9 5/8

-

19.51

60.6

T

61 1/2

21 1/2

9 3/4

-

19.62

60.9

-

-

10

0.781

19.84

61.6

T 1/2

-

20

20

10 1/4

-

20.02

62.2

U

62 3/4

21

22 3/4

10 1/2

0.797

20.2

62.8

U 1/2

-

20 1/4

22

10 5/8

-

20.32

63.1

V

63

23 3/4

10 3/4

-

20.44

63.5

-

-

11

0.814

20.68

64.1

V 1/2

-

20 3/4

23

11 1/8

-

20.76

64.3

W

65

25

11 1/4

-

20.85

64.7

-

-

11 3/8

-

20.94

65

W 1/2

-

11 1/2

-

21.08

65.3

-

-

21

24

11 5/8

0.83

21.18

65.7

X

66 1/4

26 1/4

11 3/4

-

21.24

66

-

-

11 7/8

-

21.3

66.3

X 1/2

-

12

0.846

21.49

66.6

Y

67 1/2

21 1/4

25

27 1/2

12 1/4

-

21.69

67.2

Y 1/2

-

12 1/2

0.862

21.89

67.9

Z

68 3/4

21 3/4

26

28 3/4

12 3/4

-

22.1

68.5

Z 1/2

-

13

0.879

22.33

69.1

-

-

22

27