4820-00-053-8751

Find complete technical information, availability, and procurement data for: 4820-00-053-8751
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-053-8751

Item Name Code

20520

Assigment Date

01/01/1961 (65 years ago)

A valve having an orifice in the poppet, disk, or the like, to permit restricted fluid flow when the valve is seated. It does not have a stem or provisions for pressure adjustments, and is similar to a valve, check with the exception of the orifice which permits fluid flow in more than one direction.

0.172 inches nominal aperture diameter, right-hand 2nd end thread direction, right-hand 1st end thread direction, 3a 2nd end thread class, 3b 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 2nd end
Thread Class: 3b 1st end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Aperture Diameter: 0.172 inches nominal
Flow Control Device: poppet
Connection Style: flare (tube) 1st end
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 1st 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
Material: aluminum alloy body
Material: rubber synthetic packing
Media For Which Designed: hydraulic fluid, phosphate-ester base single 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
2R2043-97	Restrictor Check Valve
32-69004-97	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-053-8751?

The FSCG of the NSN 4820-00-053-8751 is 4820

Does the NSN 4820-00-053-8751 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-053-8751 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 4820-00-053-8751 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-053-8751 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 4820-00-053-8751 was assigned to the Federal Catalog?

It was assigned 65 years ago, on Sun, Jan 1, 1961