Back Home / Fasteners / Washers / LOCK WASHER INTERNAL ZINC 1/4″ INTERNAL TOOTHED LOCK WASHER INTERNAL ZINC 1/4″ INTERNAL TOOTHED SKU: ILW14 Categories: Fasteners, Washers A hardened circular washer with twisted prongs or teeth which extend inward from the inside edge of the washer. This style is preferred when finished appearance is crucial and the teeth must be hidden under the head of the screw Made from spring steel, zinc plated. Rockwell Hardness: C40-50. Inside Diameter: Min .256 Max .267 Outside Diameter: Min .460 Max .478 Thickness: Min .023 Max .028 Case Quantity: 100 Log In For Pricing