4820-00-845-3990

Find complete technical information, availability, and procurement data for: 4820-00-845-3990
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-845-3990

Item Name Code

20520

Assigment Date

01/01/1960 (66 years ago)

right-hand 2nd end thread direction, poppet flow control device, 3a 2nd end thread class, 3b 1st end thread class, 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
Flow Control Device: poppet
Disk Loading Method: spring
Connection Style: flared (tube) 2nd end
Connection Type: threaded external tube 2nd end
Connection Type: threaded internal tube 1st end
Mounting Position: horizontal
Thread Quantity Per Inch: 20 2nd end
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: 0.438 inches 2nd end
Seat Angle: 37.0 degrees 2nd end
Nominal Outside Diameter Tube Accommodated: 0.250 inches 2nd end
Nominal Outside Diameter Tube Accommodated: 0.250 inches 1st end
Special Features: 2.730 in. lg over-all,0.875 in. across flats
Material: aluminum alloy 2024 body
Material: rubber synthetic packing
Material: steel comp 303 flow control device
Media For Which Designed: fuel/oil, hydrocarbon single response
Surface Treatment: anodize
Surface Treatment Document And Classification: mil-a-8625,ty 2 mil spec single treatment response
Style Designator: straight thru
Thread Series Designator: unf 1st end
Thread Series Designator: unf 2nd 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
1R3049-79	Restrictor Check Valve
32-69004-79	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-845-3990?

The FSCG of the NSN 4820-00-845-3990 is 4820

Does the NSN 4820-00-845-3990 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-845-3990 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 4820-00-845-3990 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-845-3990 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 4820-00-845-3990 was assigned to the Federal Catalog?

It was assigned 66 years ago, on Fri, Jan 1, 1960