Abstract: A threaded fastener having an elongated threaded shaft portion, an enlarged head portion connected in axial alignment to said shaft portion, and a plurality of longitudinal grooves positioned circumferentially around said head portion. The fastener has a longitudinal axis, and the grooves are positioned parallel to this axis. The grooves engage the shaft portion adjacent the head, such that the grooves extend completely from the free end of the head to the point where the shaft is connected to the head. The grooves preferably extend radially toward the longitudinal axis to a depth equal to the outer diameter of the threaded shaft.

Abstract: A driver with an internal stack of fasteners that feed automatically out the open end of its tubular shaft. Fasteners having spaced grooves complementally fit a plurality of inwardly protruding spaced splines in the driver shaft. The splines also engage the shaft of the fastener to position and stabilize the fastener so that it can be started into a hole. A friction catch adjacent the open shaft end engages the head to prevent inadvertent removal of the fastener from the shaft and a coil spring automatically gently urges the stack toward the open end.