National Stock Number
5310-01-330-8518
National Stock Number (NSN) 5310-01-330-8518, or NIIN 013308518, (washer,preload indicating) was assigned December 9, 1990 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 3 suppliers. Today, 3 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 2 suppliers are 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 unique to one weapons system.
Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Apr 12, 2013, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The data or the rights to use the data needed to purchase this part from additional sources are not owned by the Government and it has been determined that it is uneconomical to purchase them. Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 42430. [AN ITEM ROUND IN SHAPE HAVING A CENTRALLY LOCATED HOLE. IT CONSISTS OF TWO CONCENTRIC (INNER AND OUTER) STEEL RINGS, THE INNER RING IS SMALLER IN DIAMETER AND HIGHER THAN THE OTHER. THESE RINGS ARE SANDWICHED BETWEEN TWO CLOSE TOLERANCE PLAIN WASHERS. AS THE ASSEMBLY IS TIGHTENED, THE INNER RING TAKES THE LOAD AND IS DEFORMED UNTIL THE LOOSE OUTER RING IS BOUND BETWEEN THE UPPER AND LOWER PLAIN WASHERS AND CANNOT BE MOVED. THE TIGHTENED LOAD IN THE BOLT IS EQUAL TO THE LOAD REQUIRED TO COMPRESS THE INNER RING. WHEN THE BINDING OF THE OUTER RING OCCURS AND CAN NOT BE MOVED, IT IS A SIGN THAT THE DESIRED LOAD HAS BEEN REACHED.]. 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 5310013308518 does not contain precious metals.
This information was last updated on Aug 01, 2025.