Which term refers to 'self-locking nut' in German?

The term for 'self-locking nut' in German is 'selbstsichernde Mutter'. This phrase directly translates to self-locking (selbstsichernd) and nut (Mutter), indicating its specific function in mechanical applications where it is designed to resist loosening under vibration or torque conditions.

In technical contexts, this type of nut is essential because it enhances the reliability of bolted connections. The design typically incorporates features that engage more effectively, reducing the chances of the nut backing off from the bolt. Understanding the exact terminology is crucial for anyone working with mechanical components, as proper identification ensures the correct parts are used, ultimately leading to reliable machinery performance.

The other options represent different concepts entirely. For instance, 'festfressen' translates to 'seizing' and is related to mechanical failure, 'Rauheit' refers to 'roughness' and pertains to surface texture rather than fasteners, and 'Bruch' means 'break' or 'fracture', which does not relate to the locking mechanism of a nut. Thus, the selected answer provides clarity on the specific nature of the component used in engineering and mechanics.