The present application describes to a screw nut for limiting the torque or the clamping force that is produced by screwing a screw onto a component to be screwed into place, as well as to the use of such a screw nut in a retainer module. The screw nut comprises a clamping body which during screwing comes to rest against the component to be screwed into place. Furthermore, the screw nut comprises a screw body, by means of which the screw nut can be screwed onto the screw. The clamping body and the screw body are movably arranged between an unlocked position and a locked position so that when a defined clamping force is exceeded the unlocked position is taken up, with a restoring force continuously acting against this state transition.