A/F.428-.437 HEAD HGT.208-.229 Unslotted HEXWASH SERRATE #4POINT Full ThreadSELF DRILL ZINC

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