Ratchets under the screw head to prevent loosening.

The serrated ratchets penetrate slightly into the supporting surface, thus increasing the loosening torque of the screw.

Features of betzer sperrzahn:
- More efficient loosening protection than tooth lock washers or similar protection devices.
- Reduced number of assembly components.
- Improved feeding at the assembly compared to screws combined with washers.
- Only slight settling of the connection.
- Loosening torque at least 50% of tightening torque.
- Reduced costs for the assembly in total.

Locking ribs under the screw head for sensitive surfaces to prevent loosening.

The ribs cause the supporting surface to deform and then harden, thus increasing the loosening torque of the screw.

Features of betzer ripptech:
- More efficient loosening protection than tooth lock washers or the like.
- Reduced number of assembly components.
- Improved feeding at the assembly compared to screws combined with washers.
- No formation of chips in mounting process.
- Reduced notching in the component.
- Reduced costs for the assembly in total.