Back Home / Fasteners / Washers / FLAT WASHER USS STAINLESS 1/2″ FLAT WASHER USS STAINLESS 1/2″ SKU: FW50SS 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: 1-3/8″ Inside Diameter: 9/16″ Case Quantity: 100 Log In For Pricing