8-18X1 1/4 Slotted Indented Hex Washer Self Tapping Screw Type B Fully Threaded Zinc (Pack Qty 4,000) BC-0820BSW

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.