Socket Head Cap Screw Torque Chart
Recommended dry torque for alloy and stainless socket head cap screws, metric sizes.
| Size | Alloy steel (in-lb) | Stainless A2 (in-lb) |
|---|---|---|
| M3 | 19 | 9 |
| M4 | 45 | 21 |
| M5 | 91 | 42 |
| M6 | 155 | 72 |
| M8 | 377 | 175 |
| M10 | 747 | 346 |
| M12 | 1302 | 604 |
Alloy = ISO 12.9 (proof 970 MPa); stainless = A2-70 (proof 450 MPa). Computed from T = K·D·F with K = 0.20 dry, clamp load = 75% of proof × stress area. Stainless fasteners gall easily — keep speeds low and consider anti-seize. Verify against your specification.
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