Threaded fastener with dual reinforcing leads for facilitating manufacture of the fastener, thread rolling die for forming the threaded fastener, and method of manufacturing the threaded fastener

摘要

A new and improved thread rolling die, for forming a new and improved threaded fastener, comprises a plurality of first, primary thread rolling die threads, and a plurality of sets of second, auxiliary thread rolling die threads alternatively interposed between successive threads of the first, primary thread rolling die threads, so as to render the manufacturing process more cost effective by reducing the the number of revolutions, through which a blank member must be rotated in order to complete the formation of the thread leads upon the blank member, to be accordingly reduced which, in turn, permits the axial length of the thread rolling dies, and the thread rolling machines, to be reduced in size.