HLS-42 HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLS-42 , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Metric , Material: Steel , Finish: Zinc-Flake Coated , Bolt Size: M42 , Inside Diameter: 43.20mm , Outside Diameter: 63.00mm