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)
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