4820-01-257-8680

Find complete technical information, availability, and procurement data for: 4820-01-257-8680
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-257-8680

Item Name Code

05488

Assigment Date

06/25/1987 (39 years ago)

flared (tube) 2nd end connection style, right-hand all ends thread direction, disk flow control device, 3a 2nd end thread class, spring disk loading method

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 Direction: right-hand all ends
Flow Control Device: disk
Disk Loading Method: spring
Connection Style: flared (tube) 2nd end
Connection Style: plain (pipe) 1st end
Valve Operation Method: automatic
Connection Type: threaded external pipe 1st end
Connection Type: threaded external tube 2nd end
Features Provided: pressure tight outlet side
Nominal Thread Size: 0.500 inches 1st end
Nominal Thread Size: 0.875 inches 2nd end
Seat Angle: 45.0 degrees 2nd end
Opening Pressure Setting: 350.0 pounds per square inch
Material: copper alloy body
Material: copper alloy flow control device
Material: copper alloy seat
Media For Which Designed: refrigerant 12 1st response
Media For Which Designed: refrigerant 22 2nd response
Media For Which Designed: refrigerant 502 3rd response
Style Designator: angle
Thread Series Designator: npt 1st end
Thread Series Designator: unjf 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
527-350PSI	Safety Relief Valve
527E-350PSI	Safety Relief Valve
B527-350	Safety Relief Valve
B527E	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-257-8680?

The FSCG of the NSN 4820-01-257-8680 is 4820

Does the NSN 4820-01-257-8680 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-257-8680 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 4820-01-257-8680 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-257-8680 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 4820-01-257-8680 was assigned to the Federal Catalog?

It was assigned 39 years ago, on Thu, Jun 25, 1987