Back Home / Fasteners / Washers / LOCK WASHER INTERNAL ZINC 3/4″ INTERNAL TOOTHED LOCK WASHER INTERNAL ZINC 3/4″ INTERNAL TOOTHED SKU: ILW34 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 .768 Max .795 Outside Diameter: Min 1.220 Max 1.245 Thickness: Min .047 Max .055 Case Quantity: 100 Log In For Pricing