National Stock Number
5310-00-437-1991
National Stock Number (NSN) 5310-00-437-1991, or NIIN 004371991, (washer,saddle) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). NIIN 004371991 was cancelled on April 30, 2010, with a cancelled status of "Item is Cancelled - Inactive." There is no known replacement specified for this stock number. This NSN does not replace any other NSNs.
There is only one manufacturer part number associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 15898. [A WASHER WITH ONE SURFACE SHAPED TO FIT A SIMILARLY CURVED SURFACE, THE OTHER SURFACE OF THE WASHER BEING EITHER PARALLEL WITH THE SHAPED SURFACE OR IN THE FORM OF RAISED BOSS HAVING EITHER A FLAT BEARING SURFACE OR A RECESS DESIGNED FOR HOLDING A NUT. EXCLUDES:WASHER (1), CONCAVE AND WASHER (1), CONVEX.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5310004371991 contains an unknown precious metal.
This information was last updated on Aug 01, 2025.