Abstract: A locking collar capable of coupling a hub-and-axle subassembly to a fork dropout of a bicycle for locking an antifriction bearing in place includes an outward pressed surface adapted to confront a pressing surface of the fork dropout, an inward abutting surface adapted to confront the antifriction bearing, an axially extending female threaded surface adapted to be screwed on a threaded end segment of an axle, a tubular extension extending from the outward pressed surface to be insertable into the fork dropout, and a plurality of circumferentially extending rib segments which are disposed on the outward pressed surface to be in pressing engagement with the pressing surface of the fork dropout in a tightened state.

Abstract: A loose resistant nut fastener includes a nut body that has a first end face, a second end face opposite to the first end face, a peripheral face connected between the first and second end faces, a threaded hole extending along a first axis and extending from the first end face toward the second end face, an engaging hole that extends from the second end face toward the first end face and that is disposed at one side of the threaded hole, and a slit that extends from the peripheral face toward the first axis and that is disposed between two axially opposite ends of the threaded hole. The nut fastener further includes a tightening component to engage the engaging hole.

Abstract: A locking collar capable of coupling a hub-and-axle subassembly to a fork dropout of a bicycle for locking an antifriction bearing in place includes an outward pressed surface adapted to confront a pressing surface of the fork dropout, an inward abutting surface adapted to confront the antifriction bearing, an axially extending female threaded surface adapted to be screwed on a threaded end segment of an axle, a tubular extension extending from the outward pressed surface to be insertable into the fork dropout, and a plurality of circumferentially extending rib segments which are disposed on the outward pressed surface to be in pressing engagement with the pressing surface of the fork dropout in a tightened state.