National Stock Number
5310-01-621-2503
National Stock Number (NSN) 5310-01-621-2503, or NIIN 016212503, (nut,self-locking,extended washer) was assigned August 29, 2013 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. 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 58 sources of supply.
This part number has not been procured by the US Government in over 5 years.
This national stock number is in high demand. Globally, demand for this NSN has originated from 29 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Aug 30, 2013, this NSN's acquisition method was noted as: Suitable for competitive acquisition for the first time. (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) 29730. [A NUT HAVING 6 FLAT SIDES AND AN INTEGRAL WASHER WHICH EXTENDS BEYOND THE FLATS OR PERIPHERY. AN INTEGRAL FEATURE IS INCORPORATED FOR LOCKING ON THE THREADS OF A MATING MEMBER.]. This item does not have a nuclear hardened feature but does have other critical feature(s) 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 5310016212503 does not contain precious metals.
This information was last updated on Aug 01, 2025.