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