SIZE

UK&AUS

USA&CA

EUR&RU

CH

JP

HK

DIAMETER

14

F 1/2

3

44

4

4

6

14mm

15

H 1/2

4

47

-

7

9

15mm

16

K 1/2

5.5

-

11 3/4

10

12

16mm

17

M 1/3

6.5

53

14

13

14.5

17mm

18

R

9

59

19

18

20.5

19mm

19

R

9

59

19

18

20.5

19mm

20

U

10.5 

62 3/4

21 1/2

21

-

20mm

21

W 1/2

11.5

66

25 1/2

24

26

21mm

22

Z 1/2

-

69

29

-

-

22mm

23

Z3

14.5

71 3/4

32 3/4

31

-

23mm