M5 Tap Drill Size and Drill Bit for M5 Thread
Use a 4.2mm drill bit
M5×0.8 · 0.1654 in / 4.2 mm · ~75% thread
M5 is a common metric thread in electronics and light assembly. The tap drill is major minus pitch: 5.0 minus 0.8 equals 4.2 mm.
At a glance
| Tap drill | 4.2mm |
|---|---|
| Inches | 0.1654 in |
| Millimetres | 4.2 mm |
| Major diameter | 5 mm |
| Pitch | 0.8 mm |
| Fine pitch | M5×0.55 → drill 4.45 mm |
Why this size
drillØ = major − pitch = 5 − 0.8 = 4.20 mm → tap drill 4.2mm
For a slightly fuller thread, a 4.3 mm drill works. The standard M5 tap drill is 4.2 mm.
Related sizes
Compare with adjacent threads – coarse, fine and the opposite measurement system: