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Inside Diameter (mm) |
Australia, United Kingdom & New Zealand |
United States & Canada |
13.9 |
F |
3 |
14.1 |
F½ |
3¼ |
14.3 |
G |
3½ |
14.5 |
G½ |
3¾ |
14.7 |
H |
4 |
14.9 |
H½ |
4¼ |
15.1 |
I |
4½ |
15.3 | I½ | - |
15.5 |
J |
4¾ |
15.7 |
J½ |
5 |
15.9 |
K |
5¼ |
16.1 |
K½ |
5½ |
16.3 |
L |
5¾ |
16.5 |
L½ |
6 |
16.7 |
M |
6¼ |
16.9 |
M½ |
6½ |
17.1 |
N |
6¾ |
17.3 |
N½ |
7 |
17.5 |
O |
7¼ |
17.7 |
O½ |
7½ |
17.9 |
P |
7¾ |
18.1 |
P½ |
8 |
18.3 |
Q |
8¼ |
18.5 |
Q½ |
8½ |
18.7 |
R |
8¾ |
18.9 |
R½ |
9 |
19.1 |
S |
9¼ |
19.3 |
S½ |
9½ |
19.5 |
T |
9¾ |
19.7 |
T½ |
10 |
19.9 |
U |
10¼ |
20.1 |
U½ |
10½ |
20.3 |
V |
10¾ |
20.5 |
V½ |
11 |
20.7 |
W |
11¼ |
20.9 |
W½ |
11½ |
21.1 |
X |
11¾ |
21.3 |
X½ |
12 |
21.5 |
Y |
12¼ |
21.7 |
Z |
12½ |
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