4-40X1/4 Phil Pan Tooth washer Thread Roll Screw Full Thread Zinc Wax (Pack Qty 5,000) BC-0404REPP

Phil Pan Tooth washer Thread Roll Screw Full Thread Zinc Wax

Tribular thread rolling screw with a gently rounded top surface and a captive, free-spinning external tooth lock washer manufactured as one assembly. As each lobe of the screw moves through the pilot hole in the nut material, it forms and work-hardens the nut thread metal, producing an uninterrupted grain flow