Back Home / Fasteners / Washers / LOCK WASHER INTERNAL ZINC 3/8″ INTERNAL TOOTHED LOCK WASHER INTERNAL ZINC 3/8″ INTERNAL TOOTHED SKU: ILW38 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 .384 Max .398 Outside Diameter: Min .670 Max .692 Thickness: Min .032 Max .040 Case Quantity: 100 Log In For Pricing