National Stock Number (NSN) 5340-00-640-4133, or NIIN 006404133, (cup,compression) 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: 5340006648206, 5330006857364.
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 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 a year. There have been 4 contracts issued for this part number, with 4 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: SPE7L123P4557, SPE5EK17P0219, SPE5EK16V4511, SPE5EK16V4511, SPE5EK15M1471. The total value of the awarded contracts has been US$ 27,141.36.
This NSN is somewhat common among different platforms, belonging to 3 different weapons systems.
There has been a small amount of 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 Apr 25, 2008, 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 annual buy value of this part falls below the screening threshold of $10,000 but it has been screened for known source(s). (NOTE: This code shall not be used when screening parts entering the inventory. It shall not be assigned in preference to or supersede any other AMSC.) Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 03435. [A NONMETALLIC CUP-SHAPED ITEM DESIGNED TO BE LOCATED WITHIN A CYLINDER, AND WHOSE CONTACT EDGE WITH THE CYLINDER WALLS IS USUALLY FEATHERED. THIS ITEM, BY MEANS OF EXTRUSION, MAKES CLOSE PHYSICAL CONTACT WITH THE CYLINDER WALLS IN ORDER TO PREVENT THE ESCAPE OF INTERNAL PRESSURE. THE ITEM MAY HAVE A CENTER HOLE AND/OR BOLT HOLES. EXCLUDES:CUP, HYDRAULIC BRAKE CYLINDER.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 5340006404133 does not contain precious metals.
This NSN is associated to Schedule B 4016995010: mechanical articles for motor vehicles, of vulcanized rubber other than hard rubber. The Schedule B End Use is listed as other parts and accessories of vehicles. NAICS classification category 326299: all other rubber product manufacturing.
This information was last updated on Aug 01, 2025.