National Stock Number (NSN) 5331-00-057-2028, or NIIN 000572028, (o-ring) was assigned June 6, 1967 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 28 manufacturer part numbers associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 7 suppliers. Today, 6 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts. ISO Group has a strong supply network for this NSN, with 23 sources of supply.
This part number is actively being procured by the US Government, with procurement history within the last 90 days. There have been 26 contracts issued for this part number, with 24 awards given. There is moderate competition for this NSN. The US Government has awarded contracts to 6 different suppliers. The last contract numbers awarded were: SPE4A525FAGMQ, SPE4A525FAGMK, SPE4A525FAGMK, SPE4A525FAGKD, SPE4A525FAGJZ. The total value of the awarded contracts has been US$ 30,986.53.
This NSN is very common among different weapons systems, belonging to 60 different platforms.
There has been a moderate amount of demand for this national stock number. Globally, demand for this NSN has originated from 14 countries. The 24 month forecast from the US Government for this part number has low volatility, with an estimated forecasted value of US$ 12,765. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Oct 20, 2007, 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) 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.]. The item is a non-aviation Critical Safety Item (CSI) whose failure will result in serious damage to equipment or serious injury or death to personnel. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5331000572028 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 Jul 01, 2025.