M24 × 2 tap drill size
22.00 mm drill — or 55/64 (0.8594 in) = 84% thread
M24 fine series, 2 mm pitch. Tap drill Ø = nominal − pitch = 24 − 2 = 22.00 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 22.00 mm | 0.8661 in | 77% |
| 55/64 (inch) | 0.8594 in / 21.83 mm | 84% |
Rounding to your nearest stock drill moves the thread percentage only a few points. Cut taps only — roll-form taps need a larger hole. Verify before you cut.
Need a different thread percentage? Open the tap drill calculator · Metric tap chart · All calculators