M24 × 3 tap drill size
21.00 mm drill — or 53/64 (0.8281 in) = 76% thread
M24 coarse series, 3 mm pitch. Tap drill Ø = nominal − pitch = 24 − 3 = 21.00 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 21.00 mm | 0.8268 in | 77% |
| 53/64 (inch) | 0.8281 in / 21.03 mm | 76% |
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