National Stock Number (NSN) 5331-00-618-1920, or NIIN 006181920, (o-ring) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN replaces 4 stock numbers: 5330012931635, 5330012325624, 5330011116721, 5330006843423.
There are 43 manufacturer part numbers associated with this NSN. 15 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 29 suppliers. Today, 22 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 15 suppliers are deemed design controlled or valid supply parts. ISO Group has a strong supply network for this NSN, with 13 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 May 23, 2019. There have been 13 contracts issued for this part number, with 13 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: SPE5E319P1490, SPE5E319P1490, SPE5E319P1490, SPE4A717PD909, SPE4A717PD909. The total value of the awarded contracts has been US$ 18,724.06.
This NSN is very common among different weapons systems, belonging to 158 different platforms.
There has been a small amount of demand for this national stock number. Globally, demand for this NSN has originated from 9 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.) 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 5331006181920 does not contain precious metals.
This NSN is associated to Schedule B 4016930000: gaskets, washers and other seals, of vulcanized rubber other than hard rubber. The Schedule B End Use is listed as industrial rubber products. NAICS classification category 339991: gasket, packing, and sealing device manufacturing.
This information was last updated on Aug 01, 2025.