Clip

A clip comprising:

• a tubular body part with an insertion hole;
• and
• elastic locking pieces, wherein the elastic locking pieces are located on the inner peripheral surface of the insertion hole and on predetermined opposite areas with respect to an axis of the insertion hole, between the elastic locking pieces, wherein each elastic locking piece extends from a first side to a second side, which is opposite to the first side, in a direction of the axis such that a leading end of the elastic locking piece approaches the axis, and wherein each elastic locking piece is elastically deformable so that the leading end separates from the axis, each of the opposite elastic locking pieces having at the leading end a locking claw that is adapted to engage a helical screw groove on an outer peripheral surface of a screw member;
• wherein each of the elastic locking pieces includes two or more composite locking claws, each of which has a straight claw portion in which a claw leading-edge extends straight in a direction orthogonal to the axis and a helical claw portion adapted to extend helically along the screw groove of the screw member so as to be continuous from the straight claw portion;
• and each of the elastic locking pieces includes a combination of the locking claws in which two of the straight claw portions and two of the helical claw portions alternate in the axial direction such that each elastic locking piece includes a combination of the composite locking claws that are different to each other in terms of the respective portions of the straight claw portion and the helical claw portion in the circumferential direction.