5/16-12X2 A/F.428-.437 Unslotted Ind Hex Washer Serrate Self Drill Full Thread Zinc (Pack Qty 600) BC-313207KWS

Used to attach plywood, soft wood or metal to metal. Serrated washer design adds greater holding power to components subject to vibrations caused by repeated movements. The 1/4-inch diameter screws, for instance, are commonly used to attach reinforcing strut or L-angle to garage doors