259A-4TT-.2

View detailed technical data, stock status, and sourcing information for: 259A-4TT-.2
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-221-8849

Item Name Code

05487

Assigment Date

12/05/1985 (40 years ago)

poppet flow control device, 3a all ends thread class, -40.0 fahrenheit 1st response maximum operating temp, spring disk loading method, right-hand all ends 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 all ends
Thread Direction: right-hand all ends
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: -40.0 fahrenheit 1st response
Maximum Operating Temp: 250.0 fahrenheit 2nd response
Connection Style: flared (tube) 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 all ends
Seat Angle: 37.0 degrees all ends
Opening Pressure Setting: 0.2 pounds per square inch
Material: aluminum alloy 2024 body
Media For Which Designed: air 1st response
Media For Which Designed: carbon dioxide 2nd response
Media For Which Designed: gas, natural 4th response
Media For Which Designed: hydraulic fluid, mineral base 3rd response
Media For Which Designed: water, salt 5th response
Surface Treatment: anodize
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
259A-4TT-.2	Check Valve
71010846002	Check Valve
CV02-42	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-221-8849?

The FSCG of the NSN 4820-01-221-8849 is 4820

Does the NSN 4820-01-221-8849 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-01-221-8849 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 4820-01-221-8849 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-221-8849 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 4820-01-221-8849 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Thu, Dec 5, 1985