M24 Delta Protekt Nord-Lock Bolt Securing Washer/Pair / HOLE DIAMETER: 1.00 INCHES NOMINAL OUTSIDE DIAMETER: 1.54 INCHES NOMINAL OVERALL HEIGHT: 0.130 INCHES NOMINAL END ITEM IDENTIFICATION: 3930-01-599-9978 HARDNESS RATING: 44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: M24 DELTA PROTEKT NORD-LOCK BOLT SECURING WASHER/PAIR COLOR: SILVER OVERALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ZINC-FLAKE,DELTA PROTEKT(REG) MFR REF SINGLE TREATMENT RESPONSE OVERALL STYLE DESIGNATOR: 118 TWO PIECE INTERLOCKING