National Stock Number
4440-00-477-9972
National Stock Number (NSN) 4440-00-477-9972, or NIIN 004779972, (chamber and o-ring assembly) was assigned March 11, 1972 in the Federal Logistics Information System (FLIS). NIIN 004779972 was cancelled on June 2, 2004, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 4540012985344. This NSN does not replace any other NSNs.
There are 3 manufacturer part numbers associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 2 suppliers. Today, 2 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts. ISO Group has several sources of supply for 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) 77777. This item does not have a critical feature such as tolerance, fit restrictions or application. Nuclear hardness properties have not been determined (not valid for input). There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4440004779972 contains an unknown precious metal.
This information was last updated on Aug 01, 2025.