644XB-1-12-28

View detailed technical data, stock status, and sourcing information for: 644XB-1-12-28
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-183-2261

Item Name Code

05488

Assigment Date

07/04/1984 (42 years ago)

right-hand 1st end thread direction, inside spring bonnet type, 3a 1st end thread class, integral bonnet attachment method, poppet flow control device

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 1st end
Thread Direction: right-hand 1st end
Flow Control Device: poppet
Bonnet Type: inside spring
Bonnet Attachment Method: integral
Disk Loading Method: spring
Valve Operation Method: automatic
Thread Quantity Per Inch: 12 1st end
Adjustable Pressure Range: +4.0 to 15.0 pounds per square inch
Maximum Operating Pressure: 3600.0 pounds per square inch single response
Nominal Thread Size: 1.062 inches 1st end
Seat Angle: 37.0 degrees 1st end
Material: rubber seat
Material: steel body
Material: steel flow control device
Thread Series Designator: un 1st 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
644XB-1-12-28	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-183-2261?

The FSCG of the NSN 4820-01-183-2261 is 4820

Does the NSN 4820-01-183-2261 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-183-2261 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 4820-01-183-2261 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-183-2261 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 4820-01-183-2261 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Wed, Jul 4, 1984