FASTENER

摘要

The invention relates to a fastener for members (M1, M2) to be clamped with a certain spacing therebetween, the fastener comprising a nut (10); a bolt (40); and a movable collar (20) having in an inner bore thereof a torque transmitting means capable of transmitting torque of a bolt, which is inserted axially into the inner bore, to the movable collar through thread-thread engagement, and wherein a portion of the thread of the bolt comprises special thread ridges (422), by which a frictional force greater than that obtained in engagement between normal threads is imparted to the thread-thread engagement.