A National Stock Number (NSN) (also NATO Stock Number) is a 13-digit numeric code, identifying all the 'standardized material items of supply' as they have been recognized by the United States Department of Defense.
Pursuant to the NATO Standardization Agreements (STANAGs), the NSN has come to be used in all treaty countries, where it is known as a NATO Stock Number.
Some examples of actual NSNs:
- M998A1 HMMWV: NSN 2320-01-371-9577
- M151A2 Jeep: NSN 2320-00-177-9258
- Polartec Watch Cap: NSN 8405-01-527-5330
- Cup, Water, Canteen: NSN 8465-00-165-6838
- M2A1 Metal Ammunition Can: NSN 8140-00-960-1699