A National Stock Number (NSN) is a unique 13-digit code assigned to an item purchased by the United States federal government. The NSN includes a 4-digit Federal Supply Classification Group (FSCG), followed by a 9-digit National Item Identification Number (NIIN). The FSCG is divided into a 2-digit Federal Supply Group (FSG) and a 2-digit Federal Supply Class (FSC). Items with similar characteristics are grouped under the same Federal Supply Group (FSG).
The Federal Supply Classification (FSC) offers a more detailed classification of parts than the Federal Supply Group (FSG). The National Item Identification Number (NIIN), which consists of 9 digits following the FSCG, includes a 2-digit National Codification Bureau (NCB) code and a 7-digit unique item identifying number. The NCB indicates the country that first coded the item. The National Stock Number (NSN) is recognized by both the United States Department of Defense and the North Atlantic Treaty Organization (NATO). The Defense Logistics Agency (DLA) oversees NSNs and is responsible for providing logistical support for parts to the US armed forces and the entire US military.
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