National Stock Number
4820-01-256-8591
National Stock Number (NSN) 4820-01-256-8591, or NIIN 012568591, (stem,fluid valve) was assigned June 9, 1987 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 one supplier. Today, there are no suppliers listed as an Active supplier for this NSN. Of the active suppliers, there are no suppliers that 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.
Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Aug 02, 2004, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. This part requires engineering source approval by the design control activity in order to maintain the quality of the part. An alternate source must qualify in accordance with the design control activity's procedures, as approved by the cognizant Government engineering activity. Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 32528. [AN ITEM USUALLY METALLIC, THREADED OR UNTHREADED, USED FOR SECURING TO OR POSITIONING INTO A MATING PART. IT IS DESIGNED TO BE USED IN A GLOBE, RELIEF, REGULATOR VALVE AND THE LIKE AS A MEANS OF CONTROLLING THE FLOW OF LIQUIDS OR GASES IN A GIVEN SYSTEM. ONE END MAY HAVE AN INTEGRAL DISK OR BE DESIGNED TO ACCOMMODATE A METALLIC OR NONMETALLIC DISK. THE OTHER END IS DESIGNED FOR A HANDWHEEL, LEVER, SPRING, DIAPHRAGM AND THE LIKE FOR NONPOWERED OPERATION OR TO ACCOMMODATE A GEAR, SOLENOID, AIR MOTOR AND THE LIKE FOR POWERED OPERATION. THE HANDWHEEL AND/OR DISK MAY BE FURNISHED WITH THE ITEM. EXCLUDES STEM, FAUCET; AND STEM, NEEDLE VALVE.]. 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 4820012568591 does not contain precious metals.
This NSN is associated to Schedule B 8481909090: parts of taps, cocks, valves and similar appliances, nesoi. The Schedule B End Use is listed as industrial machines, other. NAICS classification category 332911: industrial valve manufacturing.
This information was last updated on Jul 01, 2025.