Design and function
- The nut body (1) is screwed onto the main thread just like a conventional nut – but is not tightened.
- Several pressure bolts (2a) with associated pressure pins (2b) are arranged around the main thread inside the nut body. When the pressure bolts are tightened, they push the pressure pins against the part to be tensioned and at the same time the screws elongate. The pre-tension force created in this way is purely axial and therefore free from harmful torsion or bending.
- The hardened disk (3) protects the tensioned parts from high pressure loads caused by the pressure pins.