Steel
The specified tightening torques for nuts and bolts are mathematical values based on the following requirements:
- Calculation according to VDI 2230 (February 2003 edition)
- Friction coefficient for threads and contact surfaces µ = 0.10
- Elastic limit utilization 90%
- Torque tools type II classes A and D according to ISO 6789
The setting values are rounded to conventional scalings or adjustment possibilities:
Screw size | Quality of the screws | ||
|---|---|---|---|
8.8 | 10.9 | 12.9 | |
Tightening torque in Nm | |||
M3 | 1.15 | 1.68 | 1.97 |
M4 | 2.64 | 3.88 | 4.55 |
M5 | 5.2 | 7.6 | 9 |
M6 | 9 | 13.2 | 15.4 |
M8 | 21.5 | 32 | 37.5 |
M10 | 42.5 | 62.5 | 73.5 |
M12 | 73.5 | 108 | 126 |
M14 | 118 | 173 | 202 |
M16 | 180 | 264 | 310 |
M18 | 258 | 368 | 430 |
M20 | 362 | 520 | 605 |
M22 | 495 | 700 | 820 |
M24 | 625 | 890 | 1040 |