How many digits are in a standard NSN?

The National Stock Number (NSN) is a 13-digit code used to identify a specific item of supply within the Inventory Control System. This numbering system facilitates the procurement, storage, and distribution of items across military and government logistics. The 13 digits are divided into four parts: the first four digits represent the Federal Supply Classification (FSC), the next four digits are the National Item Identification Number (NIIN), which is unique to the item, and the last digit serves as a check digit that helps verify the accuracy of the NSN. This well-structured format ensures that each military item can be distinctly identified, managed, and tracked throughout the logistics process. Understanding this structure is essential for anyone involved in supply chain management within the Navy or other branches of the armed forces.