HLB-30SS HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLB-30SS , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Metric , Material: Stainless Steel , Finish: AISI 316L , Bolt Size: 1-1/8 Inch UNC (M30) , Inside Diameter: 1.240 Inch (31.40mm) , Outside Diameter: 2.300 Inch (58.50mm)