4820-01-138-6721

Find complete technical information, availability, and procurement data for: 4820-01-138-6721
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-138-6721

Item Name Code

05487

Assigment Date

09/18/1982 (43 years ago)

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes:valve (1), relief, pressure and temperature.

3b 2nd end thread class, poppet flow control device, right-hand 1st end thread direction, right-hand 2nd end thread direction, 3a 1st end thread class

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 1st end
Thread Class: 3b 2nd end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Flow Control Device: poppet
Maximum Operating Temp: 280.0 fahrenheit single response
Minimum Operating Temp: -40.0 fahrenheit
Connection Style: flared (tube) 1st end
Connection Style: gasket seal (boss) 2nd end
Valve Operation Method: automatic
Connection Type: threaded external tube 1st end
Connection Type: threaded internal boss 2nd end
Mounting Position: horizontal or vertical
Thread Quantity Per Inch: 12 1st end
Thread Quantity Per Inch: 12 2nd end
Maximum Operating Pressure: 600.0 pounds per square inch single response
Nominal Thread Size: 1.062 inches 1st end
Nominal Thread Size: 1.062 inches 2nd end
Seat Angle: 37.0 degrees 1st end
Material: aluminum alloy 2024 body
Material Document And Classification: qq-a-200/3, alloy 2024, ta fed spec single material response body
Media For Which Designed: air 1st response
Media For Which Designed: alcohol, ethyl 2nd response
Media For Which Designed: carbon dioxide 3rd response
Media For Which Designed: ethylene glycol 4th response
Media For Which Designed: fuel/oil, hydrocarbon 5th response
Style Designator: straight thru
Thread Series Designator: un 1st end
Thread Series Designator: un 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
675VP04-1	Check Valve
859A12BT	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-138-6721?

The FSCG of the NSN 4820-01-138-6721 is 4820

Does the NSN 4820-01-138-6721 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-01-138-6721 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 4820-01-138-6721 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-138-6721 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 4820-01-138-6721 was assigned to the Federal Catalog?

It was assigned 43 years ago, on Sat, Sep 18, 1982