Notes concerning tightening torques
The tightening torques are based on the following friction coefficients:
Friction coefficient μG,K for thread and head contact surface | Strength class of screw |
|---|---|
0.14 | 8.8 / 70Stainless steel screws |
0.09 | 10.9, 12.9 |
If screws with a different friction coefficient are used, the tightening torques must be adapted accordingly.
Only use one of the following tools to tighten the screws:
- Torque wrench
- Torque-controlled torque wrench
- Impulse driver, switched off and controlled mechanically
- Torque wrench with light and sound signal
- Motorized torque wrench with dynamic torque measurement
- Torque-controlled, gradual hydraulic tools
