Back Home / Fasteners / Washers / LOCK WASHER EXTERNAL ZINC #12 EXTERNAL TOOTHED LOCK WASHER EXTERNAL ZINC #12 EXTERNAL TOOTHED SKU: ELW12 Categories: Fasteners, Washers A hardened circular washer with twisted prongs or teeth which extend out from the outer edge of the washer. Most common of all tooth-lock washers. Offers the greatest locking efficiency since the teeth are on the largest radius. Made from spring steel, zinc plated. Rockwell Hardness: C40-50 Inside Diameter: Min .221 Max .231 Outside Diameter: Min .460 Max .475 Thickness: Min .020 Max .027 Case Quantity: 100 Log In For Pricing