M22 × 1.5 tap drill size
20.50 mm drill — or 13/16 (0.8125 in) = 70% thread
M22 fine series, 1.5 mm pitch. Tap drill Ø = nominal − pitch = 22 − 1.5 = 20.50 mm (≈77% thread, the standard chart value).
| Drill | Size | Thread % |
|---|---|---|
| 20.50 mm | 0.8071 in | 77% |
| 13/16 (inch) | 0.8125 in / 20.64 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