Parts Directories

The Federal Catalog System (FCS) is a Government-wide program established by the Defense Cataloging and Standardization to provide a uniform system of item identification.

The structure of the Federal Supply Class (FSC), as presently established, consists of 78 Federal Supply Group (FSG), and 645 Federal Supply Classes (FSC).

Each 13-digit National Stock Number (NSN) is assigned to an item of supply and comprises the 4 digits FSC, 2 digits country of origin (COO), and 7 digits that are sequentially assigned and unique to each NSN.

Details and example as below:

For example, 5305 is the FSC for screws. It is used to group like items. The next two digits make up the COO code that signifies the country that originally requested the NSN assignment. COO codes 00 and 01 are both used to identify the United States. The remaining seven digits of the NSN are sequentially assigned and are unique to each NSN. The following is an example of an NSN for a screw:

5305000712072 Screw, Cap, Hexagon Head

5305: FSC

00: COO

0712072: Seven-digit sequentially assigned number

FEDERAL SUPPLY CLASSIFICATION

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