National Stock Number (NSN) 4820-00-393-7340, or NIIN 003937340, (valve,vent) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN replaces 2 stock numbers: 2520007824162, 2520000494766.
There are 7 manufacturer part numbers associated with this NSN. 7 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 6 suppliers. Today, 4 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, with the most recent procurement date of Aug 23, 2011. There have been 3 contracts issued for this part number, with 3 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 3 different suppliers. The last contract numbers awarded were: SPM7M211M5390, SPM7M211V1061, SPM7M211M0206. The total value of the awarded contracts has been US$ 1,721.62.
This NSN is somewhat common among different platforms, belonging to 2 different weapons systems.
There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Feb 24, 2011, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The data needed to produce this item from additional sources is not physically available. Valid AMCs: 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 35935. [A VALVE DESIGNED TO RELIEVE INTERNAL PRESSURE FROM GEAR HOUSINGS, AUTOMOTIVE AXLES, DIFFERENTIALS, TRANSMISSIONS AND THE LIKE. MAY OR MAY NOT BE THREADED ON ONE END. FOR ITEMS WITH RELIEF PRESSURE RATINGS SEE VALVE (1), SAFETY RELIEF.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4820003937340 does not contain precious metals.
This NSN is associated to Schedule B 8481809050: other taps, cocks, valves, etc., nesoi. The Schedule B End Use is listed as industrial machines, other. NAICS classification category 332911: industrial valve manufacturing.
This information was last updated on Aug 01, 2025.