557-80

View detailed technical data, stock status, and sourcing information for: 557-80
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-940-7941

Item Name Code

05487

Assigment Date

12/07/1965 (60 years ago)

An item of various shapes (usually circular, conical, cylindrical, or rectangular) used to prevent or regulate the flow of liquids or gases through the valve. May include a retainer, screw, holder, and the like.

3b all ends thread class, gasket seal (boss) all ends connection style, disk flow control device, 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: 3b all ends
Thread Direction: right-hand all ends
Flow Control Device: disk
Disk Loading Method: spring
Connection Style: gasket seal (boss) all ends
Valve Operation Method: automatic
Connection Type: threaded internal boss all ends
Mounting Position: horizontal or vertical
Maximum Operating Pressure: 50.0 pounds per square inch single response
Nominal Thread Size: 0.750 inches all ends
Material: aluminum alloy body
Material: aluminum alloy flow control device
Media For Which Designed: air single response
Style Designator: straight thru
Thread Series Designator: unf all ends

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-00-529-3631	No Name Available	10/06/1973

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
2-2844-76	Check Valve
277970	Check Valve
557-80	Check Valve
K1340-3	Check Valve
MS28050	Check Valve
MS28050-3	Check Valve
VS16206	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-940-7941?

The FSCG of the NSN 4820-00-940-7941 is 4820

Does the NSN 4820-00-940-7941 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-940-7941 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 4820-00-940-7941 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-940-7941 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 4820-00-940-7941 was assigned to the Federal Catalog?

It was assigned 60 years ago, on Tue, Dec 7, 1965