Abstract: The invention described herein relates to a method of making a threaded nut fastener which joins with a threaded male or screw fastener wherein the threads of the nut are partially formed so as to provide for up to 80% thread-to-thread engagement of the screw threads with the nut threads.

Abstract: A method of manufacturing a threaded fastener of the self-tapping type is described, where the fastener has the conventional head, shank, and pilot end. The shank includes a helically wound thread member impregnated with a carbide or other, harder substance than the metal from which the fastener is made. A method of making a thread-cutting fastener having its pilot tip end impregnated, is also described. A method utilizing a thread-rolling machine with a unique impregnating electrode is disclosed. The electrode is shown to engage the fastener selectively during the thread-rolling operation itself.

Abstract: A threaded fastener of the self-tapping type is described having the conventional head, shank, and pilot end. The shank includes a helically wound thread member impregnated with a carbide or other, harder substance than the metal from which the fastener is made. A thread-cutting fastener, having its pilot tip end impregnated is also described. A thread-rolling machine with a unique impregnating electrode is disclosed. The electrode is shown to engage the fastener selectively during the thread-rolling operation itself.