5310-01-012-2764 (024-021584PC1)
NSN 5310-01-012-2764 (NIIN 01-012-2764) is a lock washer in Federal Supply Class 5310, Nuts And Washers — a washer, usually round, with a centrally-located hole. Manufacturer part number 024-021584PC1 (Pentair Valves & Controls Us Lp, CAGE 66850); also referenced as 300480 (Emerson Automation Solutions Final).
NIIN assigned November 1975; DEMIL A (none required); ships at 0.001 lb / 0 cu ft.