5310-00-011-8029 (FFW84CLASSASTYLE1)
NSN 5310-00-011-8029 (NIIN 00-011-8029) is a lock washer in Federal Supply Class 5310, Nuts And Washers — a washer, usually round, with a centrally-located hole. Manufacturer part number FFW84CLASSASTYLE1 (Federal Specifications Promulgated, CAGE 81348); also referenced as MS35337-19 (Military Standards).
Key specs: 45 to 53 rockwell c hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required). Related NSN 5310-00-584-7890.