8-18X3/8 Unslotted Indent Hex Washer Serrated Self Tap Screw Type B Full Thread Zinc (Pack Qty 10,000) BC-0806BWS

For molded or through holes in thin metal, non-ferrous castings, plastics or resin-filled plywood Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum Steel: AISI 1016 - 1024 or equivalent steel.