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National Stock Number (NSN) is a 13-digit numeric code, identifying all the standardized material items of supply as they have been recognized by all NATO countries including United States Department of Defense (DOD).

 

The 13-digit NSN # 3120-01-152-2039 is comprised of

 

  • First 2 digits - Federal Supply Group (FSG) number (31 in case of NSN 3120-01-152-2039)
  • First 4 digits - Federal Supply Class (FSC) number (3120 in case of NSN 3120-01-152-2039)
  • Last 9 digits - National Item Identification Number (NIIN) (01-152-2039 in case of 3120-01-152-2039)