Which statement correctly identifies the NSN composition?

Which statement correctly identifies the NSN composition?

• A. A 13-digit stock number consisting of the four-digit FSC and the nine-digit NIIN.
• B. A nine-digit number that is part of the NSN.
• C. A 4-digit identifier followed by a 9-digit serial.
• D. A 13-digit number using the FSC and NSN together.

Answer: (A)

The NSN is a 13-digit stock number built from a four-digit Federal Supply Classification and a nine-digit National Item Identification Number. The FSC groups items by broad product category, while the NIIN uniquely identifies the exact item within that category, giving a globally unique reference when combined. This structure—FSC plus NIIN to make a 13-digit NSN—is why the statement describing the NSN as a 13-digit number consisting of the four-digit FSC and the nine-digit NIIN is correct. The other descriptions don’t match this exact composition (a NSN is not just a nine-digit number, and mixing in NSN with FSC or other fragments doesn’t reflect the true 13-digit FSC+NIIN format).

The NSN is a 13-digit stock number built from a four-digit Federal Supply Classification and a nine-digit National Item Identification Number. The FSC groups items by broad product category, while the NIIN uniquely identifies the exact item within that category, giving a globally unique reference when combined. This structure—FSC plus NIIN to make a 13-digit NSN—is why the statement describing the NSN as a 13-digit number consisting of the four-digit FSC and the nine-digit NIIN is correct. The other descriptions don’t match this exact composition (a NSN is not just a nine-digit number, and mixing in NSN with FSC or other fragments doesn’t reflect the true 13-digit FSC+NIIN format).