M16 × 2 tap drill size
14.00 mm drill — or 35/64 (0.5469 in) = 81% thread
M16 coarse series, 2 mm pitch. Tap drill Ø = nominal − pitch = 16 − 2 = 14.00 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 14.00 mm | 0.5512 in | 77% |
| 35/64 (inch) | 0.5469 in / 13.89 mm | 81% |
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