DIAMETER IN MM 

US

UK

EU / FR

JP

14.05

3

F 1/2

44.0

4

14.25

3 1/4

G

44.5

5

14.45

3 1/2

G 1/2

45.5

14.65

3 3/4

H

46.0

6

14.86

4

H 1/2

46.5

7

15.04

4 1/4

I

47.0

15.27

4 1/2

J

48.0

8

15.53

4 3/4

J 1/2

48.5

15.70

5

K

49.0

9

15.90

5 1/4

K 1/2

50.0

10

16.10

5 1/2

L

50.5

16.30

5 3/4

L 1/2

51.0

11

16.51

6

M

51.5

16.71

6 1/4

M 1/2

52.5

12

16.92

6 1/2

N

53.0

13

17.13

6 3/4

N 1/2

53.5

17.35

7

O

54.5

14

17.45

7 1/4

O 1/2

55.0

17.75

7 1/2

P

55.5

15

17.97

7 3/4

P 1/2

56.5

16

18.19

8

Q

57.0

18.35

8 1/4

Q 1/2

57.5

17

18.53

8 1/2

R

58.0

18.69

8 3/4

R 1/2

59.0

18

18.89

9

S

59.5

19

19.22

9 1/4

S 1/2

60.0

19.41

9 1/2

T

61.0

20

19.62

9 3/4

T 1/2

61.5

19.84

10

U

62.0

21

20.02

10 1/4

U 1/2

63.0

22

20.20

10 1/2

V

63.5

20.44

10 3/4

V 1/2

64.0

23

20.68

11

W

64.5

24

20.85

11 1/4

W 1/2

65.5

21.08

11 1/2

X

66.0

25

21.24

11 3/4

X 1/2

66.5

26

21.49

12

Y

67.5

21.69

12 1/4

Y 1/2

68.0

27

21.89

12 1/2

Z

68.5

28

22.10

12 3/4

Z 1/2

69.0

22.33

13

Z+1

70.0

29

22.4

13 1/4

Z+1 1/2

70.5

22.60

13 1/2

Z+2

71.0

30

22.8

13 3/4

Z+2 1/2

71.5

23.00

14

Z+3

72.0

31

23.2

14 1/4

Z+3 1/2

72.5

32

23.41

14 1/2

Z+4

73.5

23.6

14 3/4

Z+4 1/2

74.0

33

23.81

15

Z+5

74.5

24.0

15 1/4

Z+5 1/2

75.0

34

24.22

15 1/2

Z+6

76.0

24.4

15 3/4

Z+6 1/2

76.5

35

24.63

16

Z+7

77.0