M12 × 1.75 tap drill size
10.25 mm drill — or Y (0.4040 in) = 76% thread
M12 coarse series, 1.75 mm pitch. Tap drill Ø = nominal − pitch = 12 − 1.75 = 10.25 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 10.25 mm | 0.4035 in | 77% |
| Y (inch) | 0.4040 in / 10.26 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