Bolt Torque Chart
Torque in N·m for a nut factor K = 0.20 (dry / lightly oiled) at 75% of proof load. Recalculate for your own friction and preload with the Bolt Torque tool.
| Thread | Class 8.8 | Class 10.9 | Class 12.9 |
|---|---|---|---|
| M3 | 1.3 | 1.9 | 2.2 |
| M4 | 3.1 | 4.4 | 5.1 |
| M5 | 6.2 | 8.8 | 10.3 |
| M6 | 10.5 | 15.0 | 17.5 |
| M8 | 25.5 | 36.5 | 42.6 |
| M10 | 50.5 | 72.2 | 84.4 |
| M12 | 88.0 | 125.9 | 147.2 |
| M16 | 218.5 | 312.7 | 365.5 |
| M20 | 426.3 | 610.1 | 713.0 |
Torque values are N·m. Always verify critical joints with a torque-tension test.
A reference aid, not a substitute for engineering judgment. Verify against the governing standard.