4820-00-485-7841

Find complete technical information, availability, and procurement data for: 4820-00-485-7841
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-485-7841

Item Name Code

20520

Assigment Date

06/19/1974 (52 years ago)

3b 1st end thread class, 0.032 inches nominal aperture diameter, 3a 2nd end thread class, right-hand 2nd end thread direction, right-hand 1st end thread direction

Product Characteristics

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

Thread Class: 3a 2nd end
Thread Class: 3b 1st end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Aperture Diameter: 0.032 inches nominal
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: 275.0 fahrenheit single response
Connection Style: external seat for gasket seal (boss) 2nd end
Connection Style: gasket seal (boss) 1st end
Valve Operation Method: automatic
Connection Type: threaded external boss 2nd end
Connection Type: threaded internal boss 1st end
Mounting Position: horizontal or vertical
Thread Quantity Per Inch: 20 1st end
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.437 inches 1st end
Nominal Thread Size: 0.437 inches 2nd end
Nominal Outside Diameter Tube Accommodated: 0.250 inches 2nd end
Nominal Outside Diameter Tube Accommodated: 0.250 inches 1st end
Special Features: the end connection identified above as the second end is the valve inlet
Material: aluminum alloy 518.0 body
Material: aluminum alloy 518.0 seat
Surface Treatment: anodize
Style Designator: straight thru
Thread Series Designator: unf 2nd end
Thread Series Designator: unjf 1st end

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
A51H209-3	Restrictor Check Valve
A51H9209-3	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-485-7841?

The FSCG of the NSN 4820-00-485-7841 is 4820

Does the NSN 4820-00-485-7841 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-485-7841 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 4820-00-485-7841 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-00-485-7841 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 4820-00-485-7841 was assigned to the Federal Catalog?

It was assigned 52 years ago, on Wed, Jun 19, 1974