5/8"/M16 Delta Protekt Nord-Lock Bolt Securing Washer/Pair / HOLE DIAMETER: 0.670 INCHES MINIMUM AND 0.678 INCHES MAXIMUM OUTSIDE DIAMETER: 0.992 INCHES MINIMUM AND 1.008 INCHES MAXIMUM OVERALL HEIGHT: 0.120 INCHES MINIMUM AND 0.140 INCHES MAXIMUM 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: 5/8/M16 DELTA PROTEKT NORD-LOCK BOLT SECURING WASHER PAIR COLOR: SILVER OVERALL MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: CARBON STEEL MFR REF SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,SC 3,TY III ASSN STD SINGLE TREATMENT RESPONSE OVERALL STYLE DESIGNATOR: 118 TWO PIECE INTERLOCKING