4K21N2S

View detailed technical data, stock status, and sourcing information for: 4K21N2S
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-796-5976

Item Name Code

05487

Assigment Date

01/01/1962 (64 years ago)

A circular, single or multipiece, rigid, metallic or nonmetallic item having a centrally located hole with a sharp edge on the inside periphery. It is supplied in various cross-sectional shapes and is designed to be installed in a cylinder, shock strut, or similar device to remove excess oil, dirt, ice, and/or foreign material from a piston, ram, or sliding rod. Excludes:packing, preformed; ring, piston; and seal ring, metal.

automatic valve operation method, right-hand all ends thread direction, ball flow control device, spring disk loading method, plain, optional end (pipe) all ends connection style

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Direction: right-hand all ends
Flow Control Device: ball
Disk Loading Method: spring
Connection Style: plain, optional end (pipe) all ends
Valve Operation Method: automatic
Connection Type: threaded internal pipe all ends
Mounting Position: horizontal or vertical
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.250 inches all ends
Special Features: pilot operated reverse flow
Material: aluminum alloy body
Material: steel flow control device
Material: steel seat
Media For Which Designed: hydraulic fluid, phosphate-ester base single response
Style Designator: cross
Thread Series Designator: npt all ends

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-00-077-1158	No Name Available	12/13/1967

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
25200-2	Check Valve
4K21N2S	Check Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-00-796-5976?

The FSCG of the NSN 4820-00-796-5976 is 4820

Does the NSN 4820-00-796-5976 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-796-5976 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 4820-00-796-5976 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-796-5976 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 4820-00-796-5976 was assigned to the Federal Catalog?

It was assigned 64 years ago, on Mon, Jan 1, 1962