PREPOČET COL NA MM
| Rozmer v palcoch “ | Rozmer v mm |
| 1/8 | 3,18 |
| 1/4 | 6,35 |
| 5/16 | 7,94 |
| 3/8 | 9,53 |
| 1/2 | 12,70 |
| 5/8 | 15,88 |
| 3/4 | 19,05 |
| 1 | 25,40 |
| 5/4 alebo 1 1/4 | 32 |
| 6/4 alebo 1 1/2 | 38 |
| 2 | 50 |
| 2 1/2 | 63 |
| 3 | 76 |
| 4 | 100 |
DOPORUČENÉ PRIEMERY DIER PRE REZANIE ZÁVITOV
| Závit | Priemer diery v mm |
| M 1 | 0,75 |
| M 2 | 1,6 |
| M 3 | 2,5 |
| M 3,5 | 2,9 |
| M 4 | 3,3 |
| M 4,5 | 3,7 |
| M 5 | 4,2 |
| M 6 | 5,0 |
| M 7 | 6,0 |
| M 8 | 6,8 |
| M 9 | 7,8 |
| M 10 | 8,5 |
| M 11 | 9,5 |
| M 12 | 10,2 |
| M 14 | 12,0 |
| M 16 | 14,0 |
| M 18 | 15,5 |
| M 20 | 17,5 |