National Stock Number (NSN) 5331-01-298-7221, or NIIN 012987221, (o-ring) was assigned April 20, 1989 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 5 manufacturer part numbers associated with this NSN. 2 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 5 suppliers. Today, 5 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 4 suppliers are 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 5 years, with the most recent procurement date of Oct 19, 2018. There have been 20 contracts issued for this part number, with 12 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 4 different suppliers. The last contract numbers awarded were: SPE5EY19F1474, SPE5EY19F1473, SPE5EY19F1475, SPE5EY19F1472, SPE5EY18F360B. The total value of the awarded contracts has been US$ 52,965.26.
This NSN is very common among different weapons systems, belonging to 37 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 May 07, 2019, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) Acquisition of this part is controlled by QPL procedures. Valid AMCs: 1 and 2.
This NSN is assigned to Item Name Code (INC) 47946. [A NONMETALLIC CIRCULAR ITEM WITH AN APERATURE, HAVING A SOLID ROUND CROSS-SECTION. THEY ARE USED PRIMARILY FOR SEALING. FOR ITEMS WITH OTHER THAN ROUND CROSS SECTION, SEE PACKING,PREFORMED. FOR NONCIRCULAR ITEMS WITH A ROUND CROSS-SECTION, SEE SEAL,NONMETALLIC ROUND SECTION AND RUBBER,ROUND SECTION.]. 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 5331012987221 contains an unknown precious metal.
This NSN is associated to Schedule B 4002199000: styrene-butadiene rubber (sbr) or carboxylated styrene-butadiene rubber (xsbr), excluding latex, nesoi. The Schedule B End Use is listed as synthetic rubber-primary. NAICS classification category 325212: synthetic rubber manufacturing.
This information was last updated on Aug 01, 2025.