Fastener including a screw member and a securing ring

摘要

A securing ring (3) is rotatably connected to a screw member (2). The screw member has a support surface (7) that faces the securing ring to transmit an axial force to the securing ring. The support surface and the counterpart support surface (13) of the securing ring each has a taper surface tooth arrangement (8,14) that may be rotated in either of two rotation directions.