M (Course Thread)
| TAP SIZE | DRILL SIZE |
| M3-0.5 | 3/32 (2.381mm) |
| M4-0.7 | #30 (3.264mm) |
| M5-0.8 | #19 (4.191mm) |
| M6-1.0 | #9 (4.978mm) |
| M8-1.25 | Letter H (6.731mm) |
| M10-1.5 | Letter R (8.51mm) |
| M12-1.75 | Letter X (10.19mm) |
| M14-2.0 | 15/32″ (11.906mm) |
| M16-2.0 | 35/64″ (13.894mm) |
| M20-2.5 | 11/16″ (17.462mm) |
MF (Fine Thread)
| M3-0.35 | #38 (2.657mm) |
| M4-0.5 | #28 (3.57mm) |
| M5-0.5 | #16 (4.51mm) |
| M6-0.75 | Letter F (5.257mm) |
| M8-1.0 | Letter J (7.04mm) |
| M10-1.25 | 11/32″ (8.73mm |
| M12-1.5 | 13/32″ (10.318mm) |
| M14-1.5 | 1/2″ (12.7mm) |
| M16-1.5 | 37/64″ (14.684mm) |
| M20-2.0 | 45/64″ (17.85mm) |