640B-1-4-2

View detailed technical data, stock status, and sourcing information for: 640B-1-4-2
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-559-4399

Item Name Code

05488

Assigment Date

11/14/1974 (51 years ago)

3b all ends thread class, poppet flow control device, right-hand all ends thread direction, spring disk loading method, 225.0 fahrenheit single 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: 3b all ends
Thread Direction: right-hand all ends
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: 225.0 fahrenheit single response
Connection Style: gasket seal(boss) all ends
Valve Operation Method: automatic
Connection Type: threaded internal boss all ends
Adjustable Pressure Range: +1500.0 to 2750.0 pounds per square inch
Maximum Operating Pressure: 3600.0 pounds per square inch single response
Nominal Thread Size: 0.750 inches all ends
Material: plastic polytetrafluoroethylene seat
Material: steel comp 303 body
Material: steel comp 416 flow control device
Media For Which Designed: hydraulic fluid, petroleum base single response
Surface Treatment: passivate
Style Designator: angle
Thread Series Designator: unf 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
516262-1	Safety Relief Valve
640B-1-1/8-2	Safety Relief Valve
640B-1-4-2	Safety Relief Valve
640B-11-8-2	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-559-4399?

The FSCG of the NSN 4820-00-559-4399 is 4820

Does the NSN 4820-00-559-4399 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-559-4399 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 4820-00-559-4399 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-559-4399 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 4820-00-559-4399 was assigned to the Federal Catalog?

It was assigned 51 years ago, on Thu, Nov 14, 1974