311903-3

View detailed technical data, stock status, and sourcing information for: 311903-3
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-456-8575

Item Name Code

22113

Assigment Date

05/02/1969 (57 years ago)

A replaceable item designed to provide a stationary seating surface for a mating, moveable item such as a valve disk or the like. The body may have a flange of various shapes. For diesel and gasoline reciprocating engines, see insert, engine valve seat.

29.500 minimum and 30.500 maximum seat angle in deg, 0.190 inches nominal flange seat to disk end height, 0.107 inches minimum and 0.113 inches maximum under flange height, 0.264 inches minimum and 0.269 inches maximum body outside diameter, angular seating surface shape

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Body Outside Diameter: 0.264 inches minimum and 0.269 inches maximum
Flange Seat To Disk End Height: 0.190 inches nominal
Under Flange Height: 0.107 inches minimum and 0.113 inches maximum
Seat Angle In Deg: 29.500 minimum and 30.500 maximum
Seating Surface Shape: angular
Material: steel comp 303 overall
Material Document And Classification: mil-s-7720 mil spec single material response overall
Style Designator: plain flanged

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
311903-3	Valve Seat

FAQs

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

What is the FSCG of the NSN 4820-00-456-8575?

The FSCG of the NSN 4820-00-456-8575 is 4820

Does the NSN 4820-00-456-8575 have a Schedule B code assigned?

Yes, the Schedule B code is 8481909090

Does NSN 4820-00-456-8575 require demilitarization?

"commerce control list items (ccli) - mut to the point of scrap required outside the united states. Inside the united states, mut is required when the demil integrity code (ic) is "3" and mut is not required when the demic is "6" (note 8)"

Does NSN 4820-00-456-8575 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-456-8575 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 4820-00-456-8575 was assigned to the Federal Catalog?

It was assigned 57 years ago, on Fri, May 2, 1969