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Metric
Metric Threads are measured simply by thread pitch. It is measured by finding the distance in millimeters between two crests of the threads.
| Diameter |
Coarse Pitch |
Tap Drill (frac, mm) |
Fine Pitch |
Tap Drill (frac, mm) |
Other Fine Thread Pitches |
| M1.6 | 0.35 | #55, 1.25 | 0.2 | | | |
| M2 | 0.4 | #52, 1.6 | 0.25 | | | |
| M2.5 | 0.45 | #46, 2.05 | 0.35 | | | |
| M3 | 0.5 | #40, 2.5 | 0.35 | | | |
| M3.5 | 0.6 | #33, 2.9 | 0.35 | | | |
| M4 | 0.7 | #30, 3.3 | 0.5 | | | |
| M5 | 0.8 | #19, 4.2 | 0.5 | | | |
| M6 | 1 | #9, 5 | 0.75 | | | |
| M7 | 1 | | 0.75 | | | |
| M8 | 1.25 | H, 6.8 | 1 | J, 7 | 0.75 | |
| M10 | 1.5 | Q, 8.5 | 1.25 | S, 8.8 | 1 | 0.75 |
| M12 | 1.75 | 13/32, 10.3 | 1.25 | 27/64, 10.8 | 1.5 | 1 |
| M14 | 2 | 15/32, 12 | 1.5 | 31/64, 12.5 | 1.25 | 1 |
| M16 | 2 | 35/64, 14 | 1.5 | 0.5625, 14.5 | 1 | |
| M18 | 2.5 | 39/64, 15.5 | 1.5 | 21/32, 16.5 | 2 | 1 |
| M20 | 2.5 | 11/16, 17.5 | 1.5 | 47/64, 18.5 | 2 | 1 |
| Diameter |
Coarse Pitch |
Tap Drill (frac, mm) |
Fine Pitch |
Tap Drill (frac, mm) |
Other Fine Thread Pitches |
| M22 | 2.5 | 49/64, 19.5 | 1.5 | 13/16, 20.5 | 2 | 1 |
| M24 | 3 | 53/64, 21 | 2 | | 1.5 | 1 |
| M27 | 3 | 61/64, 24 | 2 | | 1.5 | 1 |
| M30 | 3.5 | 1 3/64, 26.5 | 3 | | 2 | 1.5 |
| M33 | 3.5 | 1 5/32, 29.5 | 3 | | 2 | 1.5 |
| M36 | 4 | 1 17/64, 32 | 3 | | 2 | 1.5 |
| M42 | 4.5 | 1 15/32, 37.5 | 4 | | 3 | 2 |
| M48 | 5 | 1 45/64, 43 | 4 | | 3 | 2 |
| M52 | 5 | 1 55/64, 47 | 4 | | 3 | 2 |
| M56 | 5.5 | 2, 50.5 | 4 | | 3 | 2 |
| M60 | 5.5 | | 4 | | 3 | 2 |
| M64 | 6 | | 4 | | 3 | 2 |
| M68 | 6 | | 4 | | 3 | 2 |
| M72 | 6 | | 4 | | 3 | 2 |
| M80 | 6 | | 4 | | 3 | 2 |
| M90 | 6 | | 4 | | 3 | 2 |
| M100 | 6 | | 4 | | 3 | 2 |
