5/16-12X1 1/2 A/F.428-.437 HEAD HGT.208-.229 Unslotted HEXWASH SERRATE #4POINT Full ThreadSELF DRILL ZINC (Pack Qty 800) BC-312407KWS4

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 AISI 1016 - 1024 or equivalent steel