Back Home / Fasteners / Washers / FLAT WASHER SAE ZINC 5/16″ FLAT WASHER SAE ZINC 5/16″ SKU: SFW56 Categories: Fasteners, Washers Used to improve stress distribution, and to span large holes. SAE PATTERN. Made from low carbon steel, zinc plated. Outside Diameter: 11/16″ Inside Diameter: 11/32″ Case Quantity: 100 Log In For Pricing