Engineering Tools
Reference data for specifying and sourcing fasteners correctly — the numbers a procurement or design engineer actually needs.
Thread pitch & tap drill size
Metric coarse and common fine pitch, with tap drill size for standard ~75% thread engagement.
| Size | Coarse pitch | Tap drill (coarse) | Fine pitch | Tap drill (fine) |
|---|---|---|---|---|
| M3 | 0.5 mm | 2.5 mm | — | — |
| M4 | 0.7 mm | 3.3 mm | — | — |
| M5 | 0.8 mm | 4.2 mm | — | — |
| M6 | 1.0 mm | 5.0 mm | — | — |
| M8 | 1.25 mm | 6.8 mm | 1.0 mm | 7.0 mm |
| M10 | 1.5 mm | 8.5 mm | 1.25 mm | 8.8 mm |
| M12 | 1.75 mm | 10.2 mm | 1.5 mm | 10.5 mm |
| M16 | 2.0 mm | 14.0 mm | 1.5 mm | 14.5 mm |
| M20 | 2.5 mm | 17.5 mm | 1.5 mm | 18.5 mm |
| M24 | 3.0 mm | 21.0 mm | 2.0 mm | 22.0 mm |