NSN (NATO Stock Number)

An NSN, short for NATO Stock Number, is the unique 13-digit number assigned to an item of supply within the NATO Codification System. NATO describes it as the primary unique identification number for codified items, so one number points to one clearly described item. The system is explained in the NATO Codification System booklet.

In Canadian public procurement, NSNs appear mainly in defence solicitations. The Department of National Defence (DND) uses them to name the exact materiel it wants to buy, from aircraft parts to electrical components. A bid team that reads the NSN correctly knows what item the buyer is asking for before it reads anything else in the notice.

How the 13 digits of an NSN are built

Every NSN follows the same pattern, usually written in four groups such as 5975-21-894-5417. The number breaks down into three parts:

• NATO Supply Classification code (NSC): the first four digits, which place the item in a classification group.
• Nation code: the next two digits.
• Item Identification Number: the final seven digits.

The nation code and the seven-digit Item Identification Number together form the NATO Item Identification Number (NIIN), as set out in the NATO booklet. The first four digits tell a reader the kind of item, and the NIIN identifies the specific item within that group.

The NATO Codification System behind the number

The NSN comes from the NATO Codification System (NCS). According to the NCS fact sheet, the system gives equipment, components and military-system parts standardized naming, description, classification and identification, and the unique identifier it produces is the NSN.

Several related terms come up alongside it. The National Codification Bureau is the national body that handles codification, and the NATO Supply Code for Manufacturers (NSCM) identifies the manufacturer of an item. NATO's own glossary of acronyms and abbreviations expands NSN as "NATO stock number."

How NSNs appear in CanadaBuys notices

CanadaBuys solicitations for aircraft replacement parts, vehicle components, spare parts and other defence goods list the NSN next to the item description. One notice for aircraft replacement parts lists NSN 1630-21-886-1766 for a piston brake. Another notice for grounding rods states that DND required items identified by NSNs 5975-21-894-5417 and 5975-21-111-2729.

The NSN is not always the only identifier. A spare-parts solicitation identifies each line by GSIN, NSN, item name, part number, NSCM/CAGE code and quantity. The NSN sits alongside manufacturer and part-number information rather than necessarily replacing it.

NSNs in United States Foreign Military Sales

NSNs also matter when Canada buys through the United States Foreign Military Sales (FMS) program. Public Services and Procurement Canada (PSPC) states that material obtained through FMS must be identified by its NSN whenever possible. PSPC reviews the requisition and statement of work before it submits a Letter of Request to the relevant U.S. Department of Defense organization. The details are on the CanadaBuys FMS page.

What an NSN means for a supplier bidding on Canadian contracts

When an NSN appears in a solicitation, it identifies the item or configuration the buyer requires. Treat it as the starting point, then read the rest of the notice. Your response must meet the complete requirements, including any stated part number, manufacturer or CAGE/NSCM code, specifications, quantity, delivery location, and inspection or certification requirements.

• Match each NSN in the notice to the item you plan to supply.
• Check the part number and manufacturer fields on the same line.
• Confirm quantities, delivery points and inspection terms before pricing.

The notices cited here establish the NSN as an identifier and show it used with associated item data. They do not set a rule that every NSN-listed item must come from one particular manufacturer, so the solicitation's own wording governs what you may offer.