4820-00-935-5443

Find complete technical information, availability, and procurement data for: 4820-00-935-5443
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-935-5443

Item Name Code

20520

Assigment Date

12/13/1967 (58 years ago)

The air purifying element of gas mask, consisting of a metal body inclosing a mechanical filter and a chemical filling which absorbs and neutralizes toxic gases and particles in the air, allowing purified air to pass through.

right-hand 1st end thread direction, right-hand 2nd end thread direction, 3b 2nd end thread class, 3a 1st end thread class, 0.097 inches nominal aperture diameter

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 Class: 3b 2nd end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Aperture Diameter: 0.097 inches nominal
Flow Control Device: cone
Disk Loading Method: spring
Maximum Operating Temp: 275.0 fahrenheit single response
Connection Style: flareless 1st end
Connection Style: gasket seal (boss) 2nd end
Valve Operation Method: automatic
Connection Type: threaded external tube 1st end
Connection Type: threaded internal boss 2nd end
Mounting Position: horizontal or vertical
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.562 inches 1st end
Nominal Thread Size: 0.562 inches 2nd end
Seat Angle: 12.0 degrees 1st end
Nominal Outside Diameter Tube Accommodated: 0.375 inches 1st end
Nominal Outside Diameter Tube Accommodated: 0.375 inches 2nd end
Material: aluminum alloy seat
Material: aluminum alloy body
Material: aluminum alloy flow control device
Material: rubber synthetic stem
Surface Treatment: anodize
Style Designator: straight thru
Thread Series Designator: unf 1st end
Thread Series Designator: unf 2nd end

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-00-947-0101	No Name Available	11/01/1988

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
1406-B450	Restrictor Check Valve
65651-06018-101	Restrictor Check Valve
65651-06018-102	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-935-5443?

The FSCG of the NSN 4820-00-935-5443 is 4820

Does the NSN 4820-00-935-5443 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-935-5443 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 4820-00-935-5443 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-935-5443 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 4820-00-935-5443 was assigned to the Federal Catalog?

It was assigned 58 years ago, on Wed, Dec 13, 1967