5310-01-059-0992 (7F7259)
NSN 5310-01-059-0992 (NIIN 01-059-0992) is a lock washer in Federal Supply Class 5310, Nuts And Washers — a washer, usually round, with a centrally-located hole. Manufacturer part number 7F7259 (Caterpillar Inc, CAGE 11083).
NIIN assigned April 1978; DEMIL A (none required); unit of issue EA (each), $0.06 gov standard price; ships at 2 lb / 0.0046 cu ft.