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What are NATO Stock Numbers?
The 13-digit NSN is made up of a 4-digit general NATO Supply Class identification code (NSC), plus a 9-digit National Item Identification Number (NIIN). The NIIN on its own is the unique identifier of each item, but the NSC originally added context to the item by indicating its general class (e.g. Weapons, Ammunition and Explosives, Aircraft Components and Accessories, Ships, etc).
The 9-digit NIIN can be listed with or without hyphens between its three groups of numbers. The NIIN's first 2 digits act as a record of which country first recognised that particular item as an important inclusion in the catalogue, and is usually the country of its origin. These 2 digits are called the Country Code (CC) or National Codification Bureau identification (NCB), so Britain's NCB is 99, while the USA has 00 and 01. The remaining 7 digits constitute an automatically issued, non significant identification code, and some of these 7 characters may be alphanumeric.
So, for example, a wheeled tractor that was manufactured in the UK would have an FSC such as the following: 2420, where 24 is the group for tractors and 20 for tractors with wheels (as opposed to caterpillar tracks). This would be followed by the NCB for the UK (99) and then by a 7-digit alphanumeric code that identifies the batch of tractors made in that issue and the particular tractor itself. When using the handy Rowse NSN Parts Finder, therefore, you would be entering a code that looks like this: 2420-99-356-0018