5310-00-936-6164 (1028676)
NSN 5310-00-936-6164 (NIIN 00-936-6164) is a spring tension washer in Federal Supply Class 5310, Nuts And Washers — a bent spring metal washer with a centrally located hole. Manufacturer part number 1028676 (Us Army Aviation And Missile Command, CAGE 18876); also referenced as 3502-20-08 (Itw Shakeproof Automotive Products).
Key specs: 40 to 50 rockwell c hardness; full characteristics table below. NIIN assigned March 1967; DEMIL A (none required); unit of issue EA (each), $91.58 gov standard price.