Abstract: A locking nut has an internal thread intended to be screwed up on a thread on a shaft and includes at least one locking element which, by way of at least one locking screw, is adapted to be pressed against the thread in the shaft, thereby locking the nut against unintentional unlocking. The locking element is provided with a releasing device incorporating at least one screw arranged to be in threaded engagement with the locking element for subjecting the locking element to a radial pulling force causing the locking element to be lifted from engagement with the shaft thread after loosening of the locking screws.

Abstract: A fastening system for securing an article to a base uses a conventional drive fastener. A reaction surface on the article contacts the bearing surface on the underside of the fastener head causing the fastener head to tilt relative to the body of the fastener. The reaction surface also causes the body of the drive fastener to deform when it is fully driven into the article, and a portion of the material from the reaction surface is displaced into the aperture to increase the retention force of the fastener.

Abstract: The invention concerns a nut provided with a locking element (4, 5, 6, 7), which by e.g. a screw (8, 9, 10, 11) can be urged radially against a screw thread. In order to provide a self-contained and easily releasable nut the locking element is arranged in a recess which, together with the element, is so arranged that at least a part (12, 13, 14, 15) of the element is deformed elastically when the element is moved against the screw thread. Thereby the element springs out of contact with the thread when the screw (8, 9, 10, 11) is released.