Two places that offer cross reference services for NSN numbers are ISO Group, a supply chain partner for the aerospace and defense industry, and NSN.info, a dedicated cross reference and parts search engine. Both companies offer these services to improve their sales, which helps ensure accuracy in database information.
Both websites offer searches and cross referencing by NSN number, and price quoting services. ISO Group also provides search capability by keyword, NATO stock number, commercial stock number and military part number. They provide the capability to browse their NSN databases and FSC databases.
In addition to NSN searches, NSN.info offers many different categories to browse. These include aircraft parts, vehicle parts, engines, hardware, and a variety of other item groupings. Browsing brings up short part descriptions, NSN numbers and part numbers.