Stainless steel
The specified tightening torques for stainless steel 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%
- Only valid for bolts according to ISO 4762, ISO 4014, ISO 4017
- Only valid for nuts according to ISO 4032, ISO 4033
- Torque tools type II classes A and D according to ISO 6789
The setting values are rounded to conventional scalings or adjustment possibilities:
Bolt size | Quality of the bolts | ||
|---|---|---|---|
Ax-50 | Ax-70 | Ax-80 | |
Tightening torque in Nm | |||
M3 | 0.376 | 0.806 | 1.07 |
M4 | 0.868 | 1.86 | 2.48 |
M5 | 1.72 | 3.68 | 4.91 |
M6 | 2.95 | 6.4 | 8.4 |
M8 | 7.2 | 15.2 | 20.5 |
M10 | 14 | 30 | 40 |
M12 | 24 | 51.5 | 69 |
M14 | 38.5 | 83 | 111 |
M16 | 59 | 127 | 169 |
M18 | 82 | 176 | 234 |
M20 | 115 | 248 | 330 |
M22 | 157 | 336 | 450 |
M24 | 199 | 425 | 570 |