Fastening device, in particular twist-off screw, with separable clamping section

摘要

The unit (1) has a section (2) with a thread (4), where the unit is shearable by an excess torque. A clamping section (10) is formed as a single piece with the section (2) in an output state of the unit and is separable from the section (2) in the case of screwing the unit. The clamping section is separable by another torque, which is smaller than the torque that is necessary for shearing the unit. The clamping section has a flat closed surface at its front surface (16), which is turned away from the section (2).