|
Size |
Diameter |
|||
|
UK |
European |
US |
Inches |
mm |
|
F ½ |
44 |
3 |
0.55 - 0.56 |
14.10 - 14.28 |
|
H |
46 |
4 |
0.57 - 0.59 |
14.70 - 14.92 |
|
H ½ - I ½ |
48 |
4 ½ - 5 |
0.59 - 0.60 |
15.01 - 15.28 |
|
J – K |
50 |
5 ½ |
0.61 - 0.63 |
15.61 - 15.92 |
|
L – L ½ |
52 |
6 - 6 ½ |
0.65 - 0.65 |
16.40 - 16.55 |
|
M ½ - N ½ |
54 |
7 |
0.67 - 0.68 |
16.99 - 17.19 |
|
O – P |
56 |
7 ½ - 8 |
0.69 - 0.70 |
17.58 - 17.83 |
|
P ½ - Q ½ |
58 |
8 ½ -9 |
0.72 - 0.73 |
18.17 - 18.46 |
|
R ½ - S |
60 |
9 - 9 ½ |
0.74 - 0.75 |
18.87 - 19.10 |
|
U ½ |
62 |
10 |
0.77 - 0.79 |
19.80 – 20.00 |
|
V |
64 |
11 |
0.80 - 0.81 |
20.40 – 20.60 |