A NIIN, or National Item Identification Number, is the 9-digit portion of an NSN that uniquely identifies a specific item, independent of the country that assigned it. While the full NSN includes a 4-digit FSC classification prefix, the NIIN itself remains constant, making it a reliable way to track and cross-reference a part across different supply systems.
This NIIN lookup organizes our entire catalog by starting digit, so you can browse to the exact range you need or use "View All" to see a complete group. Every entry connects to detailed part information, including CAGE Code data and manufacturer traceability, so you can confirm a supplier before moving forward with a purchase.
If you already have a full stock number, our broader NSN parts catalog lets you search by the complete code rather than the NIIN alone. Once you've located the right item through this NIIN catalog, submit an RFQ to receive pricing and availability within minutes.
Why the NIIN Matters When Sourcing Parts
Because the National Item Identification Number stays consistent regardless of which country or agency assigned the original NSN, it's one of the most reliable ways to confirm you're looking at the exact same part across different catalogs, suppliers, or NSN part types. Running a quick NIIN parts search helps buyers avoid confusion when comparable items are listed under slightly different stock numbers.
At Aero OEM Parts, every result in this NIIN catalog is backed by verified sourcing, cross-checked against manufacturer records and CAGE Code documentation. Combined with our strict No China Sourcing pledge, this NIIN lookup gives procurement teams a dependable way to confirm part identity before committing to an order.
