National Stock Number
5310-01-553-1658
National Stock Number (NSN) 5310-01-553-1658, or NIIN 015531658, (washer,flat) was assigned July 10, 2007 in the Federal Logistics Information System (FLIS). NIIN 015531658 was cancelled on March 2, 2014, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 5310006191148. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN. ISO Group has built a very strong supply chain for this NSN. We have direct relationships with 30 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 Sep 06, 2013. There have been 6 contracts issued for this part number, with 6 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: SPM5E813M8075, SPM5E813M7812, SPM5E113V5464, SPM5A111V1025, SPM5A110V2967. The total value of the awarded contracts has been US$ 146.30.
This NSN is fairly common among different weapons systems, belonging to 24 different platforms.
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 Nov 17, 2020, 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) 13393. [A WASHER HAVING A CENTRALLY LOCATED HOLE WITH A SOLID OR LAMINATED CROSS-SECTION AND TWO FLAT PARALLEL BEARING SURFACES. THE HOLE MUST BE 75 PERCENT OR LESS THAN THE LARGEST DIMENSION AND THE BEARING SURFACE FINISH IS GREATER THAN 32 MICROINCH (0.8 MICROMETER). THE THICKNESS CANNOT EXCEED 25 PERCENT OF THE LARGEST OUTSIDE DIMENSION. WHEN THE LARGEST OUTSIDE DIMENSION IS LESS THAN 1/4 INCH OR 6MM, THE THICKNESS MUST BE 0.006 INCHES (0.15MM) OR GREATER AND FOR ITEMS 1/4 INCH (6MM) OR LARGER, THE THICKNESS MUST BE 0.016 INCHES (0.4MM) OR GREATER. THE MAXIMUM TOLERANCE IS APPLIED TO DIMENSIONS AND USED AS A DETERMINING FACTOR. ITEMS WITH SEPARABLE LAMINATION USE SHIM. FOR ITEMS FABRICATED FROM CERAMIC OR ELECTRICALLY RATED MATERIALS BY SPECIFICATION OR INDUSTRY STANDARDS USE INSULATOR (1), WASHER. EXCLUDES:DISK, VALVE, GRAPHITE IMPREGNATED AND LUBRICATED ITEMS.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5310015531658 does not contain precious metals.
This information was last updated on Aug 01, 2025.