Back Home / Fasteners / Washers / FLAT WASHER SAE ZINC 5/16″ THRU HARDENED FLAT WASHER SAE ZINC 5/16″ THRU HARDENED SKU: 8SFW56 Categories: Fasteners, Washers Used to improve stress distribution, and to span large holes. Yellow zinc plated. Made from heat treated thru-hardened steel. SAE PATTERN Outside Diameter: 11/16″ Inside Diameter: 11/32″ Case Quantity: 100 Log In For Pricing