M10 Tap Drill Size and Drill Bit for M10 Thread
Use a 8.5mm drill bit
M10×1.5 · 0.3346 in / 8.5 mm · ~75% thread
M10 is a common metric thread in machinery and automotive work. The tap drill is major minus pitch: 10.0 minus 1.5 equals 8.5 mm.
At a glance
| Tap drill | 8.5mm |
|---|---|
| Inches | 0.3346 in |
| Millimetres | 8.5 mm |
| Major diameter | 10 mm |
| Pitch | 1.5 mm |
| Fine pitch | M10×1.25 → drill 8.75 mm |
Why this size
drillØ = major − pitch = 10 − 1.5 = 8.50 mm → tap drill 8.5mm
For M10 x 1.25 fine pitch use an 8.8 mm drill. The standard M10 x 1.5 tap drill is 8.5 mm.
Related sizes
Compare with adjacent threads – coarse, fine and the opposite measurement system: