Abstract: A fastener includes a socket for fastening to a mounting through hole of a first metal plate member, a screw member inserted through the socket for threading into a screw hole of a second metal plate member to joint the first and second metal plate members together, a barrel molded on the head of the screw member and axially movably coupled to the socket for enabling the screw member to be moved axially relative to the socket and rotated with the barrel relative to the socket and having interference devices protruded from the inside wall for friction engagement with the socket, and a spring member sleeved onto the shank of the screw member and stopped between the head of the screw member and an inside annular flange of the socket.

Abstract: A quick-positioning screw assembly includes a cap having an inside annular flange and a locating groove or locating rib extending around the inside wall, a mounting socket bonded to a mounting through hole of a first plate member and having a top positioning flange extending around the periphery and detachably forced into engagement with the locating groove or locating rib of the cap, a screw press-fitted into the inner diameter of the inside annular flange of the cap for threading into a screw hole on a second plate member to secure the first plate member to the second plate member, and a compression spring mounted in the cap around the screw and stopped between the inside annular flange of the cap and an inside annular flange of the mounting socket.

Abstract: A quick-positioning screw assembly machining method includes the step of attaching a quick-positioning screw assembly to a chucking device of a machine tool and then driving the chucking device to rotate the quick-positioning screw assembly, the step of moving a ramming member toward a relatively thinner front extension cap wall of a cap during rotation of the quick-positioning screw assembly to have the relatively thinner front extension cap wall of the cap be bent radially inwards into contact with a periphery of a mounting socket between two outside annular flanges of the mounting socket, and the step of stopping the rotation of the chucking device and removing the processed quick-positioning screw assembly from the machine tool.