4R122

View detailed technical data, stock status, and sourcing information for: 4R122
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-284-1027

Item Name Code

20520

Assigment Date

09/05/1973 (52 years ago)

3a all ends thread class, spring disk loading method, right-hand all ends thread direction, poppet flow control device, -65.0 fahrenheit 1st response maximum operating temp

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 all ends
Thread Direction: right-hand all ends
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: -65.0 fahrenheit 1st response
Maximum Operating Temp: 275.0 fahrenheit 2nd response
Connection Style: flareless all ends
Valve Operation Method: automatic
Connection Type: threaded external tube all ends
Mounting Position: horizontal or vertical
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.438 inches 2nd end
Nominal Thread Size: 0.562 inches 1st end
Seat Angle: 12.0 degrees all ends
Material: steel comp 630 overall
Media For Which Designed: hydraulic fluid, phosphate-ester base single response
Surface Treatment: passivate
Style Designator: straight thru
Thread Series Designator: unjf all ends

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
4R122	Restrictor Check Valve
4R122-129	Restrictor Check Valve
6F2966-129	Restrictor Check Valve
749959-129	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-284-1027?

The FSCG of the NSN 4820-00-284-1027 is 4820

Does the NSN 4820-00-284-1027 have a Schedule B code assigned?

Yes, the Schedule B code is 8481302090

Does NSN 4820-00-284-1027 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 4820-00-284-1027 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-284-1027 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 4820-00-284-1027 was assigned to the Federal Catalog?

It was assigned 52 years ago, on Wed, Sep 5, 1973