National Stock Number (NSN)
A National Stock Number (NSN) is the 13-digit code that identifies an item of supply in the NATO Codification System. The US Defense Logistics Agency and the national codification bureaus of NATO and partner countries use it to buy, store and issue the same item under one number, whoever manufactures it.
Structure of an NSN
| Part | Digits | Example (5305-00-725-4197) | Meaning |
|---|---|---|---|
| FSG | 1–2 | 53 | Federal Supply Group – Hardware and Abrasives |
| FSC | 1–4 | 5305 | Federal Supply Class – Screws |
| NCB code | 5–6 | 00 | Country that codified the item (00/01 = USA) |
| NIIN | 5–13 | 00-725-4197 | National Item Identification Number, unique to the item |
NSN Parts We Manufacture
- O-Rings & Seals (FSC 5331) – O-rings and seals in military standard (MS, AN, NAS) and customer-specified sizes.
- Gaskets (FSC 5330) – Flat, flange and cut gaskets and packing materials made to drawing or specification.
- Sealing Elements (FSC 5330, 5331) – Oil seals, rotary shaft seals and sealing rings for hydraulic and mechanical systems.
- Pins (FSC 5315) – Dowel, spring, cotter, clevis, grooved and taper pins, machine keys.
- Washers (FSC 5310) – Flat, lock, spring and special washers to military and commercial standards.
- Bolts & Screws (FSC 5305, 5306, 5307) – Machine screws, cap screws, set screws, hex and shoulder bolts, studs.
- Fasteners (FSC 5310, 5320, 5325, 5340, 5365) – Nuts, rivets, inserts, quick-release fasteners, clamps, rings, shims and spacers.
How to Find an NSN
Use the Advanced NSN Search to look up an item by NSN, NIIN, manufacturer part number (reference number), CAGE code, manufacturer name or item name. Each NSN page shows the item's characteristics, manufacturer part numbers, management data, award and price history and the solicitations we have recorded.