UK |
US |
Approximate Inside Diameter (mm) |
A | 1/2 | 12.04 |
A 1/2 | 12.2 | |
B | 1 | 12.45 |
B 1/2 | 12.6 | |
C | 1 1/2 | 12.85 |
C 1/2 | 13 | |
D | 2 | 13.26 |
D 1/2 | 13.4 | |
E | 2 1/2 | 13.67 |
E 1/2 | 13.8 | |
F | 3 | 14.07 |
F 1/2 | 14.2 | |
G | 3 1/2 | 14.48 |
G 1/2 | 14.6 | |
H | 4 | 14.88 |
H 1/2 | 15 | |
I | 4 1/2 | 15.29 |
I 1/2 | 15.4 | |
J | 4 3/4 | 15.6 |
J 1/2 | 15.8 | |
K | 5 1/4 | 16 |
K 1/2 | 16.1 | |
L | 5 3/4 | 16.4 |
L 1/2 | 16.6 | |
M | 6 1/4 | 16.8 |
M 1/2 | 17 | |
N | 6 3/4 | 17.2 |
N 1/2 | 17.4 | |
O | 7 1/4 | 17.6 |
O 1/2 | 17.8 | |
P | 7 3/4 | 18 |
P 1/2 | 18.2 | |
Q | 8 1/4 | 18.4 |
Q 1/2 | 18.6 | |
R | 8 3/4 | 18.8 |
R 1/2 | 19 | |
S | 9 1/4 | 19.2 |
S 1/2 | 19.4 | |
T | 9 3/4 | 19.6 |
T 1/2 | 19.8 | |
U | 10 1/4 | 20 |
U 1/2 | 20.2 | |
V | 10 3/4 | 20.4 |
V 1/2 | 20.6 | |
W | 11 1/4 | 20.8 |
W 1/2 | 21 | |
X | 11 3/4 | 21.2 |
X 1/2 | 21.4 | |
Y | 12 1/4 | 21.6 |
Y 1/2 | 21.8 | |
Z | 12 1/2 | 22 |