NSN 4820-00-406-6604, 4820004066604
VALVE,RESTRICTOR CHECK

Federal Supply Classification: FSC 4820 - Valves, Nonpowered
National Item Identification Number: NIIN 004066604
Codification Country: United States
Item Name Code: INC 20520
Criticality: (X) This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
Hazardous Material Indicator Code: (N) There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials.

Availability: Readily Available Qualified Suppliers: We have 1 qualified suppliers

Manufacture or supply this part?
Join our growing community of certified suppliers.

Let Us Know

CALL ABOUT NSN 4820-00-406-6604

Our client representatives are standing by to help fulfill your request.

+1-321-773-5710

REQUEST QUOTE for 4820-00-406-6604

Have a list that needs to be quoted? Upload it here.

Upload a List

DLMS^® Summary

National Stock Number 4820-00-406-6604

National Stock Number (NSN) 4820-00-406-6604, or NIIN 004066604, (valve,restrictor check) was assigned April 17, 1970 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.

There are 3 manufacturer part numbers associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 2 suppliers. Today, 2 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 2 suppliers are deemed design controlled or valid supply parts.

This part number has not been procured by the US Government in over 5 years.

This NSN is somewhat common among different platforms, belonging to 5 different weapons systems.

Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Apr 25, 2008, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The annual buy value of this part falls below the screening threshold of $10,000 but it has been screened for known source(s). (NOTE: This code shall not be used when screening parts entering the inventory. It shall not be assigned in preference to or supersede any other AMSC.) Valid AMCs: 1, 2, 3, 4 and 5.

This NSN is assigned to Item Name Code (INC) 20520. [A VALVE HAVING AN ORIFICE IN THE POPPET, DISK, OR THE LIKE, TO PERMIT RESTRICTED FLUID FLOW WHEN THE VALVE IS SEATED. IT DOES NOT HAVE A STEM OR PROVISIONS FOR PRESSURE ADJUSTMENTS, AND IS SIMILAR TO A VALVE, CHECK WITH THE EXCEPTION OF THE ORIFICE WHICH PERMITS FLUID FLOW IN MORE THAN ONE DIRECTION.]. 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 4820004066604 contains an unknown precious metal.

This information was last updated on Jul 01, 2025.