5310-00-595-5048 (FFW84CLASSASTYLE2)
NSN 5310-00-595-5048 (NIIN 00-595-5048) 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); also referenced as R5137C6 (Whittaker Corp Whittaker Electronic).
Key specs: 45 to 53 rockwell c hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required). Related NSN 5310-00-045-4007.