TOP

RING SIZE TABLE 

Japanese

Diam
inch

Diam
mm

Circ
mm

USA
Size

British 

French 

German 

Swiss 

-

.390

9.91

-

0000

-

-

-

-

-

.422

10.72

-

00

-

-

-

-

-

.454

11.53

-

0

-

-

-

-

-

.474

11.95

-

1/2

A

-

-

-

-

.482

12.18

-

3/4

A 1/2

-

-

-

1

.487

12.37

38.9

1

B

-

-

-

-

-

12.60

39.6

1 1/4

B 1/2

-

-

-

-

.503

12.78

40.2

1 1/2

C

-

-

-

-

-

13.00

40.8

1 3/4

C 1/2

-

-

-

2

.520

13.21

41.5

2

D

41 1/2

13 1/2

1 1/2

-

-

13.41

42.1

2 1/4

D 1/2

-

-

3

.536

13.61

42.7

2 1/2

E

42 3/4

13 3/4

2 3/4

-

-

13.83

43.4

2 3/4

E 1/2

-

-

-

4

.553

14.05

44.0

3

F

44

14

4

-

-

14.15

44.3

3 1/8

F 1/2

-

-

-

-

14.25

44.6

3 1/4

-

-

-

-

5

-

14.36

44.9

3 3/8

G

45 1/4

-

5 1/4

-

.569

14.45

45.2

3 1/2

-

-

14 1/2

-

6

-

14.56

45.6

3 5/8

 G 1/2

-

-

-

-

-

14.65

45.9

3 3/4

H

46 1/2

-

6 1/2

7

.585

14.86

46.5

4

H 1/2

-

15

-

-

-

15.04

47.1

4 1/4

47 3/4

-

7 3/4

8

.601

15.27

47.8

4 1/2

I 1/2

-

15 1/4

-

-

15.40

48.1

4 5/8

J

49

15 1/2

9

-

-

15.53

48.4

4 3/4

-

-

-

-

9

.618

15.70

49.0

5

J 1/2

-

15 3/4

-

-

-

15.80

49.3

5 1/8

K

50

-

10

-

15.90

49.6

5 1/4

-

-

-

-

10

-

16.0

50.0

5 3/8

K 1/2

-

-

-

-

.634

16.10

50.3

5 1/2

L

51 3/4

16

11 3/4

-

-

16.30

50.9

5 3/4

-

-

-

-

-

-

16.41

51.3

5 7/8

L 1/2

-

-

-

12

.650

16.51

51.5

6

M

52 3/4

16 1/2

12 3/4

-

-

16.71

52.2

6 1/4

M 1/2

-

-

-

13

.666

16.92

52.8

6 1/2

N

54

17

14

-

-

17.13

53.4

6 3/4

N 1/2

-

-

-

14

.683

17.35

54.0

7

O

55 1/4

17 1/4

15 1/4

-

-

17.45

54.7

7 1/4

O 1/2

-

-

-

15

.699

17.75

55.3

7 1/2

P

56 1/2

17 3/4

16 1/2

-

-

17.97

55.9

7 3/4

P 1/2

-

-

-

16

.716

18.19

56.6

8

Q

57 3/4

18

17 3/4

-

-

18.35

57.2

8 1/4

Q 1/2

-

-

-

17

.732

18.53

57.8

8 1/2

-

-

18 1/2

-

-

-

18.61

58.4

8 5/8

R

59

-

19

-

-

18.69

58.4

8 3/4

-

-

-

-

-

-

18.80

59.0

8 7/8

R 1/2

-

-

-

18

.748

18.89

59.1

9

-

-

19

 -

-

-

19.10

59.4

9 1/8

S

60 1/4

-

20 1/4

-

-

19.22

59.7

9 1/4

-

-

-

-

-

-

19.31

60.0

9 3/8

S 1/2

-

-

-

19

.764

19.41

60.3

9 1/2

-

-

19 1/2

 -

-

-

19.51

60.6

9 5/8

T

61 1/2

-

21 1/2

-

-

19.62

60.9

9 3/4

-

-

-

-

20

.781

19.84

61.6

10

T 1/2

-

20

-

21

-

20.02

62.2

10 1/4

U

62 3/4

-

22 3/4

22

.797

20.20

62.8

10 1/2

U 1/2

-

20 1/4

-

-

-

20.32

63.1

10 5/8

V

63

-

23 3/4

-

-

20.44

63.5

10 3/4

-

-

-

-

23

.814

20.68

64.1

11

V 1/2

-

20 3/4

 -

-

-

20.76

64.3

11 1/8

W

65

-

25

-

-

20.85

64.7

11 1/4

-

-

-

-

-

-

20.94

65.0

11 3/8

W 1/2

-

-

-

24

-

21.08

65.3

11 1/2

-

-

21

-

-

.830

21.18

65.7

11 5/8

X

66 1/4

-

26 1/4

-

-

21.24

66.0

11 3/4

-

-

-

-

-

-

21.30

66.3

11 7/8

X 1/2

-

-

-

25

.846

21.49

66.6

12

Y

67 1/2

21 1/4

27 1/2

26

.862

21.89

67.9

12 1/2

Z

68 3/4

21 3/4

28 3/4

-

-

22.10

68.5

12 3/4

Z 1/2

-

-

-

27

.879

22.33

69.1

13

-

-

22

-





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