M8 Screw Size and Thread Pitch
M8 = 8.0 mm outer diameter, 1.25 mm coarse pitch, 6.8 mm tap drill, 6 mm hex key. Torque ≈ 25 N·m (8.8 steel).
Open the interactive Standards & Sizes tool →Key facts
| Outer diameter | 8.0 mm |
|---|---|
| Pitch (coarse) | 1.25 mm |
| Tap drill | 6.8 mm |
| Socket head A/F | 6 mm |
| Tightening torque | 25 N·m (8.8) |
Frequently asked questions
What is the pitch of an M8 screw?
The standard coarse pitch for M8 is 1.25 mm; outer diameter is 8.0 mm.
What tap drill is needed for M8?
Use a 6.8 mm drill for an M8 tapped hole (coarse, ISO 261).
Related pages
M8 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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