M3 Screw Size and Thread Pitch
M3 = 3.0 mm outer diameter, 0.5 mm coarse pitch, 2.5 mm tap drill, 2.5 mm hex key. Torque ≈ 1.3 N·m (8.8 steel).
Open the interactive Standards & Sizes tool →Key facts
| Outer diameter | 3.0 mm |
|---|---|
| Pitch (coarse) | 0.5 mm |
| Tap drill | 2.5 mm |
| Socket head A/F | 2.5 mm |
| Tightening torque | 1.3 N·m (8.8) |
Frequently asked questions
What is the pitch of an M3 screw?
The standard coarse pitch for M3 is 0.5 mm; outer diameter is 3.0 mm.
What tap drill is needed for M3?
Use a 2.5 mm drill for an M3 tapped hole (coarse, ISO 261).
Related pages
M3 Screw is part of Standards & Sizes on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
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