M36 × 3 tap drill size

33.00 mm drill — or 1-19/64 (1.2969 in) = 79% thread

M36 fine series, 3 mm pitch. Tap drill Ø = nominal − pitch = 36 − 3 = 33.00 mm (≈77% thread, the standard chart value).

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