Fastener for clamping members having a certain spacing from each other while maintaining the certain spacing therebetween

摘要

A fastener for members (M1, M2) to be clamped with a certain spacing therebetween includes a nut (10); a bolt (40); and a moveable collar (20) having in an inner bore thereof a torque transmitting device capable of transmitting torque of the bolt, which is axially inserted into the inner bore, to the movable collar through thread-thread engagement, and wherein a portion of the thread of the bolt includes special thread ridges (422), by which a frictional force is imparted to the thread-thread engagement.