HLS-14 HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLS-14 , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Metric , Material: Steel , Finish: Zinc-Flake Coated , Bolt Size: 9/16 Inch UNC (M14) , Inside Diameter: 0.600 Inch (15.20mm) , Outside Diameter: 0.910 Inch (23.00mm)