Every part used and solicit in the federal supply chain is classified and categorized by a National Stock Number or NATO Stock Number (NSN), an exclusive 13-digit identifying number, which is composed of more specific subgroups of numbers, each label a specific piece of information. The most general classifications are the first subgroups which is a 4-digit Federal Supply Classification Group (FSCG). Relatively related items will also have similar FSCGs. The Federal Supply Group (FSG), a 2-digit number, is the first part of the FSCG. The 2-digit Federal Supply Code (FSC) that follows is more specific. The next 9 numbers that follow in the NSN are known as the NIIN, or National Item Identification Number. This includes a 2-digit NCB (National Codification Bureau) that signifies the country to first codify the item as well as 7-digit unique item identifying number.

The National Stock Number, which is recognized by both the North Atlantic Treaty Organization (NATO) and the US Department of Defense, is governed by the Defense Logistics Agency. This is an agency that is responsible for all logistical support to the US armed forces and US military agencies.

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