Defence & Military II (EN)
What is a NATO Stock Number (NSN) — and how does a part get one?
A NATO Stock Number is a 13-digit code that identifies an item of supply unambiguously across the alliance. It combines a four-digit supply classification with a nine-digit item identification number, whose first two digits show which country codified the item. Numbers are issued only by national codification bureaus, never by companies themselves.
Related services
How the number is built
An NSN is usually written in four blocks. The first four digits are the NATO Supply Classification and place the item in a broad commodity group. The remaining nine digits form the National Item Identification Number, which on its own already identifies the item uniquely.
The first two digits of that identification number record the country that first codified the item — generally the country of final manufacture. Germany uses the code 12. The remaining seven characters are a non-significant serial code. The system is also used by a number of countries outside NATO.
How an item receives a number
- A requirement arises: an item is to be taken into government supply, normally in the course of a procurement.
- The customer initiates it: companies do not apply for their own NSN; codification is triggered by the procuring authority.
- Data is collected: the manufacturer supplies the technical identification data — drawing, material, dimensions, reference numbers and its NCAGE code.
- The number is issued: the national codification bureau checks for duplicates and assigns the number.
An NSN is therefore neither a quality mark nor a market entry ticket. It is a logistics key ensuring that the same item is held under the same number by every participating force, whoever manufactured it.
Why it matters to suppliers
Anyone producing spare parts will meet NSNs in enquiries and purchase orders. The number points to a precisely defined item, including drawing revision and material. Supplying something equivalent but different is therefore ruled out as long as the number stays the same.
Two consequences follow. Any deviation from the recorded specification has to be released in advance by the customer, and traceability records must map back to the codified item. For shops that re-manufacture obsolete parts the NSN is also the natural starting point when researching the original technical data.
Key points
- An NSN is a 13-digit logistics key for items of supply across the alliance.
- Structure: four-digit supply class plus nine-digit item identification number.
- The first two digits of the identification number show the codifying country; Germany is 12.
- Numbers are issued by national bureaus — companies cannot apply for their own.
Related questions
Is an NSN the same as a manufacturer part number?
No. The manufacturer part number remains in use and is linked to the NSN as a reference number. The NSN is the higher-level, government-issued identifier under which the same item is managed in supply systems regardless of its source.
Can a company request an NSN for its product?
Not directly. Codification is initiated by a government body, normally during a procurement. The company contributes by supplying the technical identification data and by holding an NCAGE code, the unique identifier for entities in NATO procurement.
What is the difference between an NSN and a NIIN?
The NIIN is the nine-digit core of the number and already identifies the item uniquely. The four-digit supply class in front of it only adds the commodity grouping. Together they form the 13-digit NATO Stock Number.
More questions
Discuss your part with us
Have a drawing or a 3D model and need a reliable assessment of feasibility, material and lead time? Send us your documents and we will come back to you with a concrete answer.