National Stock Number: 5305-99-390-9095
  Federal Supply Class: 5305
  National Item Identification Number: 993909095
  Description: SCREW,TAPPING
  Detail: A hardened externally threaded fastener whose thread extends to the bearing surface of the head. The thread may be fluted or otherwise designed to cut or form its own mating thread. Excludes SCREW, ASSEMBLED WASHER. 
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