National Stock Number (NSN) 5310-00-407-9566, or NIIN 004079566, (washer,lock) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN replaces 49 stock numbers. Five of the National Stock Numbers that it replaces are: 5310015678862, 5310015729320, 5310015564495, 5310015591696, 5310013806624.
There are 89 manufacturer part numbers associated with this NSN. 43 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 69 suppliers. Today, 56 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 20 suppliers are deemed design controlled or valid supply parts. ISO Group has built a very strong supply chain for this NSN. We have direct relationships with 60 sources of supply.
This part number has not been procured by the US Government in over 5 years, with the most recent procurement date of Mar 16, 2018. There have been 12 contracts issued for this part number, with 14 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 5 different suppliers. The last contract numbers awarded were: SPE5EY18F7425, SPE5EY18F7425, SPE5EY18F7425, SPE5EY18F6397, SPE5EY18F5092. The total value of the awarded contracts has been US$ 117,933.65.
This NSN is very common among different weapons systems, belonging to 611 different platforms.
This national stock number is in high demand. Globally, demand for this NSN has originated from 20 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Apr 02, 2006, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The Government has unlimited rights to the technical data, and the data package is complete. Valid AMCs: 1 and 2.
This NSN is assigned to Item Name Code (INC) 14218. [A WASHER, USUALLY ROUND, WITH A CENTRALLY-LOCATED HOLE. ITS EDGES AND TWO BEARING SURFACES ARE DESIGNED IN SUCH A WAY THAT APPLIED PRESSURE BRINGS INTO PLAY THE SPRING TENSION AND/OR FRICTIONAL LOCKING PRINCIPLE THAT MATERIALLY RESISTS ANY TENDENCY TOWARD TURNING. IT MAY BE MADE OF ONE OR TWO PIECES.]. 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 5310004079566 does not contain precious metals.
This NSN is associated to Schedule B 7318210000: spring washers and other lock washers, iron or steel. The Schedule B End Use is listed as finished metal shapes. NAICS classification category 332722: bolt, nut, screw, rivet, and washer manufacturing.
This information was last updated on Jul 01, 2025.