Back Home / Fasteners / Washers / FLAT WASHER USS ZINC 1/4″ FLAT WASHER USS ZINC 1/4″ SKU: FW14 Categories: Fasteners, Washers Used to improve stress distribution, and to span large holes. USS PATTERN. Made from low carbon steel, zinc plated. Outside Diameter: 3/4″ Inside Diameter: 5/16″ Case Quantity: 100 Log In For Pricing