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A complete listing of groups is provided in NAVSUP P-485, Afloat Supply Procedures. The NIIN
consists of a two-digit national codification bureau (NCB) code and seven digits which, in conjunction
with the NCB code, uniquely identify each NSN item in the Federal Supply System. For example:
Two NCB codes are assigned for the United States, 00 and 01. Code 00 identifies all FSNs (11-digit
federal stock numbers used prior to NSNs) assigned prior to 31 March 1975. Code 01 identifies the
numbers assigned after that time. The NCBs must be included and be correct, or the material may be
rejected or you may receive the wrong material.
NAVY ITEM CONTROL NUMBERS (NICNs).—Material not included in the Federal Catalog
System, but stocked or monitored in the Navy Supply System, are listed by 13-character Navy item
control numbers (NICNs). These NICNs are readily identified by a two-position alpha code which
signifies the type of NICN. This code and a seven-position alphanumeric uniquely identify each NICN
item in the Navy Supply System. NICN codes that are currently used and examples of NICNs follow:
NICN CODE
APPLICATION
EXAMPLE
LE
Poseidon items common to Trident
1220-LE-F00-4016
LF
Stock numbers for forms
1018-LF-504-2201
LK
Aircraft change kit numbers
1234-LK-UA1-2345
LP
Stock numbers for publications
0530-LP-485-0000
LS
Special programs alteration kit numbers
1234-LS-123-4567
LX
ASO local control numbers
1560-LX-NPI-2345
LL
Local control numbers (Temporary)
4820-LL-000-1234
Local control numbers (Permanent)
7520-LL-CAO-0001
Note: The permanent local control number can always be recognized by a C in the seventh position.
Parts can be ordered by using a NIIN or NICN.
PART NUMBERS (PNs).—A part number (also known as reference number) may be used to
identify a material item or to assist you in finding the current NSN. Part numbers include old NSNs,
FSNs, electron tube type numbers, and electronic equipment circuit symbol numbers. Two other
important sources for reference numbers are manufacturers' part numbers and Navy drawing and piece
