Back Home / Fasteners / Washers / FLAT WASHER USS STAINLESS 5/16″ FLAT WASHER USS STAINLESS 5/16″ SKU: FW56SS Categories: Fasteners, Washers Used to improve stress distribution, and to span large holes. USS PATTERN. Used where parts are subject to corrosion. Made from 18-8 stainless steel. Outside Diameter: 7/8″ Inside Diameter: 3/8″ Case Quantity: 100 Log In For Pricing