Back Home / Fasteners / Washers / LOCK WASHER EXTERNAL ZINC 3/8″ EXTERNAL TOOTHED LOCK WASHER EXTERNAL ZINC 3/8″ EXTERNAL TOOTHED SKU: ELW38 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 .384 Max .398 Outside Diameter: Min .670 Max .694 Thickness: Min .032 Max .040 Case Quantity: 100 Log In For Pricing