Structure of an NSN
An NSN is structured in a standardized 9999-00-999-9999 format and is divided into two main components:
Federal Supply Classification (FSC): The first 4 digits indicate the general commodity group and class of the item (e.g., aircraft structural components, electrical fittings).
National Item Identification Number (NIIN): The remaining 9 digits uniquely identify the specific material item.
National Codification Bureau (NCB) Code: The first 2 digits of the NIIN designate the country that assigned the number (such as 00 or 01 for the United States).
Item Number: The final 7 digits form a unique non-sequential code for that specific supply item.
How NSNs Link with CAGE Codes, FSC, and Manufacturers
In defense procurement, an NSN does not exist in isolation. It forms the center of an interconnected chain connecting the FSC, the Manufacturer and their unique CAGE Code:
Link to FSC (Federal Supply Class): The first 4 digits of the NSN are the FSC. This code categorizes the item into standardized commodity groups so buyers can filter supply catalog searches.
Link to CAGE Code (Commercial and Government Entity): Every manufacturer approved to produce an item assigned an NSN is given a unique 5-character CAGE code. In defense cataloging databases (like WebFLIS), an NSN is directly mapped to the specific CAGE codes authorized to build that part.
Link to Manufacturer & Part Number: One NSN can be mapped to multiple original equipment manufacturers (OEMs) if their parts meet identical military specifications. The NSN links directly to the manufacturer specific part number (MPN) and facility location via their CAGE code.
Breakdown of NSN Components
To better understand how an NSN is constructed, review the structural breakdown below:
Segment | Position | Digit Count | Purpose & Description | Example |
FSC Group | Digits 1–2 | 2 Digits | Identifies the general category/family of items. | 53 (Fasteners & Hardware) |
FSC Class | Digits 3–4 | 2 Digits | Identifies the specific sub-class within the group. | 10 (Nuts & Washers) |
NCB Code | Digits 5–6 | 2 Digits | Country of origin/assignment (First 2 digits of NIIN). | 01 (United States) |
Item Number | Digits 7–13 | 7 Digits | Unique alphanumeric sequence for the specific part. | 543-2109 |
Full NSN | Digits 1–13 | 13 Digits | Complete standardized 13-digit identifier. | 5310-01-543-2109 |
Why Procure NSN Parts Through Parts 3Sixty
Sourcing military-standard and defense hardware requires complete supply chain transparency, speed, and strict regulatory compliance. Parts 3Sixty provides a trusted, streamlined procurement platform tailored to defense contractors and aerospace operators:
15-Minute Guaranteed RFQ Turnaround: Submit a request online 24/7/365 and receive a customized quote within 15 minutes.
Strict Quality Assurances: Fully accredited with AS9120B, ISO 9001:2015, and FAA AC 00-56B quality certifications.
No China Sourcing Pledge: All parts come with complete lot traceability, manufacturer certifications, and rigorous pre-shipment inspections.
U.S.-Based Fulfillment & Export Compliance: Full adherence to ITAR regulations, NIST standards, and U.S. export control laws.
Massive Inventory Database: Access to over 2 billion stocked and hard-to-find items spanning NSNs, NIINs, CAGE codes, and Federal Supply Classes.
Frequently Asked Questions (FAQs)
What is the NSN number
An NSN (National Stock Number) is a 13-digit standardized code used by the U.S. Department of Defense and NATO members to identify, purchase, and track military and defense logistics items.
What is an NSN code
"NSN code" is simply an alternate term for a National Stock Number. It refers to the exact same 13-digit code that classifies an item's federal supply group, assigning country, and unique item number.
How do I find an NSN number
You can find an NSN by searching official logistics databases like Web FLIS (Federal Logistics Information System), commercial procurement databases (such as Parts 3Sixty), or cross-referencing CAGE codes, manufacturer part numbers (MPNs), or item descriptions in military supply catalogs.
How to obtain an NSN number
To get a new NSN assigned to a product an authorized government entity or defense agency must submit a cataloging request through their national cataloging.
