A/F.428-.437 HD Hgt.172-.190 Slotted Indented Hex Washer Serrate Self Drill Full Thread 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.