|
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 |