Back Home / Fasteners / Washers / FLAT WASHER USS ZINC 9/16″ THRU HARDENED FLAT WASHER USS ZINC 9/16″ THRU HARDENED SKU: 8FW96 Categories: Fasteners, Washers Used to improve stress distribution, and to span large holes. USS PATTERN. Made from heat treated thru-hardened steel, zinc yellow. Outside Diameter: 1-1/2″ Inside Diameter: 5/8″ Case Quantity: 50 Log In For Pricing