M12 Delta Protekt Nord-Lock Bolt Securing Washer/Pair / HOLE DIAMETER: 0.530 INCHES MINIMUM AND 0.538 INCHES MAXIMUM OUTSIDE DIAMETER: 0.762 INCHES MINIMUM AND 0.778 INCHES MAXIMUM OVERALL HEIGHT: 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM END ITEM IDENTIFICATION: 3930-01-599-9978 PART NAME ASSIGNED BY CONTROLLING AGENCY: 1/2 NORDLOCK BOLT SECURING PREASSEMBLED WASHER,ZINC FLAKE PLATED MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL STYLE DESIGNATOR: 118 TWO PIECE INTERLOCKING