M30 × 2 tap drill size
28.00 mm drill — or 1-7/64 (1.1094 in) = 70% thread
M30 fine series, 2 mm pitch. Tap drill Ø = nominal − pitch = 30 − 2 = 28.00 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 28.00 mm | 1.1024 in | 77% |
| 1-7/64 (inch) | 1.1094 in / 28.18 mm | 70% |
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