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NATO Stock Number (NSN)
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A 13-digit number, e.g. 5305-21-111-3333 broken
down as follows: (1) Digits 1-4, e.g. 5305, the NATO supply classification
consisting of Group 53 (which covers all items of hardware) followed by
the class within the group 05 (screws), 06 (bolts), etc., the whole being
known as the supply class. (2) Digits 5-6, e.g. -21-, the NATO code for
the National Codification Bureau that assigned the stock number, e.g. 00
U.S.A., 21 Canada, 14 France, 99 U.K., etc. (3) Digits 7-13, e.g. 111-3333,
the National Item Identification Number; non-significant, but sequentially
assigned by each National Codification Bureau to a unique item of supply.
(4) Digits 5-13, e.g. 21-111-3333, the NATO Item Identification Number;
including both the NATO code of the National Codification Bureau and its
item identification number. The last 9 digits of the number remain with
the item throughout its life even though the NATO supply classification
may change as a result of reclassification and consequent conversion of
stock numbers, e.g. 5305-21-111-2222 converted to 2805-21-111-2222. (23/06/94)
(numéro de nomenclature de l'OTAN)
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