NCS1 (NATO codification system)

The NATO Codification System (NCS) is a uniform and common system for the identification, classification and stock numbering of items of supply. NATO describes it as a disciplined process in which every item of supply is uniquely identified, correctly characterized and assigned a standardized NATO Stock Number (NSN). In Publicus glossary usage, "NCS1" labels this codification meaning. The system is documented in the NATO NCS fact sheet.

The guiding principle is "one item, one number." Each unique item of supply receives a single NSN that stays with it through its life, so a purchaser in one country and a logistician in another refer to the same physical item with the same code. The NCS is not an inventory or accounting system. It is the common data language those systems use to describe materiel, and it has been in operation since the late 1950s, now shared by more than 60 nations.

How a NATO Stock Number is built

The NSN is a 13-digit identifier, usually written XXXX-YY-ZZZ-ZZZZ, with three parts. The CanadaBuys Supply Manual glossary sets out the structure:

• NATO Supply Classification Code (digits 1 to 4): the supply group and class. Group 53 covers hardware, and class 05 covers screws, giving code 5305.
• Nation Code (digits 5 and 6): identifies the National Codification Bureau that assigned the number. Canada is 21, the United States is 00 and the United Kingdom is 99.
• National Item Identification Number (digits 7 to 13): a non-significant sequential number assigned by the bureau. It carries no meaning about the item itself.

The Nation Code and the item identification number together form the NATO Item Identification Number. It stays constant even if the item is later moved to a different supply class. The glossary example 5305-21-111-3333 is a screw-class item codified by Canada.

Standards and publications behind the NCS

The NCS runs under NATO Standardization Agreements (STANAGs) and Allied Codification Publications. Five STANAGs form its structural basis: 3150 for supply classification, 3151 for item of supply identification, 4177 for data acquisition, 4199 for exchange of materiel management data, and 4438 for dissemination of data associated with NSNs. Background on one of them is available on the STANAG 3151 page.

The principal document is Allied Codification Publication No. 1 (ACodP-1), the NATO Manual on Codification. It sets the operating procedures and the responsibilities of national codification bureaux, users and contractors, and it is published through NATO Allied Committee 135. AC/135 brings together national directors of codification and oversees the system.

Each participating nation has one National Codification Bureau that handles codification for its military and industry. Codified data feeds the NATO Master Catalogue of References for Logistics (NMCRL), a master record of NSNs and manufacturer references available to authorized users. In Canada, the Department of National Defence administers the Canadian component of the system.

NCS the codification system versus NCS the command structure

NATO also uses the acronym NCS for the NATO Command Structure, the hierarchy formed by Allied Command Operations and Allied Command Transformation. That meaning concerns command and control and has nothing to do with item identification.

When a tender or contract mentions NCS alongside stock numbers, NSNs, ACodP-1, AC/135 or a codification bureau, it means the NATO Codification System.

What NCS codification means for a Canadian bidder

Defence and materiel requirements can call for items to be identified with a NATO Stock Number. Suppliers need to read NSNs correctly and match offered goods to existing numbers. For new items, they may need to provide accurate technical data so that DND's National Codification Bureau can assign an NSN.

Access to the Canadian Government Catalogue of Material follows NATO rules under STANAG 4438. Contractors may be asked to sign non-disclosure agreements to see proprietary data. Check the contract clauses, including those in the Standard Acquisition Clauses and Conditions Manual, for codification obligations before you price.