Abstract: A rolling flat die operable on a blank to produce a threaded element having self-locking threads includes a flat die moveable in a forward direction to engage the blank and form the self-locking threads on the blank. The flat die has a first section and a second section, the first section having a first plurality of first thread-forming parts having a first outer crest and a first inner root, the second section having a plurality of second thread-forming parts parallel to one another and parallel to the first thread-forming parts, each of the second thread-forming parts having a second outer crest and a second inner root.

Abstract: A method of manufacturing a self-locking threaded element includes the steps of disposing a blank element in which the self-locking threads are to be formed between two spaced rolling dies, contacting the start ends of each die with the blank element such that one die extends from its start end to its finish end in one direction and the other die extends from its start end to its finish end in an opposite direction, applying a pressure to the rolling dies, moving the two rolling dies in opposite directions a first distance, rotating the blank element a first amount as the two dies are moved the first distance causing the two oppositely moving dies to form a helical first groove in the rotating blank element, moving the dies in such opposite direction a second distance, rotating the blank element a second amount as the two dies are moved such second distance causing the two oppositely moving dies to superimpose a second deeper groove over alternate first grooves such that the deeper grooves define the flanks o

Abstract: A self-locking screw has a longitudinal axis and comprises a thread having an inner radial portion and an outer radial portion, the inner radial portion having a pair of opposite first side faces defining a flank angle of the screw. The outer radial portion has a pair of opposite second side faces extending from the first side faces and first and second outer radial faces extending respectively from the pair of opposite second side faces. The thread has a central buffer groove having two groove side walls, the groove side walls along with the second side faces and the first and second outer radial faces defining two axial spaced elastically deformable thread portions which are elastically deformable such that as the thread is threaded onto a counterpart threaded member, the elastically deformable thread portions are engaged by the counterpart threaded member to cause elastic deformation as the thread portions axially approach one another and reduce the spacing between the thread portions.