5310-00-531-9699 (FFW84CLASSASTYLE2)
NSN 5310-00-531-9699 (NIIN 00-531-9699) is a lock washer in Federal Supply Class 5310, Nuts And Washers — a washer, usually round, with a centrally-located hole. Manufacturer part number FFW84CLASSASTYLE2 (Federal Specifications Promulgated, CAGE 81348).
Key specs: 45 to 53 rockwell c hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); unit of issue EA (each), $0.11 gov standard price; ships at 0.01 lb / 0.0004 cu ft.