M12 × 1.5 tap drill size
10.50 mm drill — or Z (0.4130 in) = 77% thread
M12 fine series, 1.5 mm pitch. Tap drill Ø = nominal − pitch = 12 − 1.5 = 10.50 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 10.50 mm | 0.4134 in | 77% |
| Z (inch) | 0.4130 in / 10.49 mm | 77% |
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