National Stock Number
4520-01-233-1640
National Stock Number (NSN) 4520-01-233-1640, or NIIN 012331640, (pipe,air conditioning-heating) has an unknown assigned date. NIIN 012331640 was cancelled on June 2, 1990, with a cancelled status of "Item is Cancelled WITHOUT Replacement." There is no known replacement specified for this stock number. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 15681. [A SHAPED PRODUCT OF SHEET METAL; ROUND, RECTANGULAR, OR SQUARE IN CROSS-SECTIONAL SHAPE. IT IS UNIFORM THROUGHOUT ITS LENGTH. USED TO CONDUCT AIR OR GAS FUMES FROM ONE AREA TO ANOTHER.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4520012331640 does not contain precious metals.
This information was last updated on Jun 01, 2025.