4820-00-923-6851

Find complete technical information, availability, and procurement data for: 4820-00-923-6851
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-923-6851

Item Name Code

22113

Assigment Date

01/20/1966 (60 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.

4.438 inches minimum and 4.439 inches maximum flange diameter, 0.483 inches minimum and 0.493 inches maximum seat radius, 3.260 inches nominal body outside diameter, 1.398 inches minimum and 1.408 inches maximum taper minor diameter, 1.398 inches minimum and 1.408 inches maximum body inside diameter

Product Characteristics

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

Flange Diameter: 4.438 inches minimum and 4.439 inches maximum
Taper Minor Diameter: 1.398 inches minimum and 1.408 inches maximum
Body Outside Diameter: 3.260 inches nominal
Body Inside Diameter: 1.398 inches minimum and 1.408 inches maximum
Seat Radius: 0.483 inches minimum and 0.493 inches maximum
Flange Seat To Disk End Height: 1.625 inches minimum and 1.627 inches maximum
Under Flange Height: 1.873 inches minimum and 1.875 inches maximum
Seating Surface Shape: radial
Material: cobalt alloy face
Material Document And Classification: mil-r-17131,type mil-rcocr-a mil spec single material response face
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
894B432PC1	Valve Seat

FAQs

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

What is the FSCG of the NSN 4820-00-923-6851?

The FSCG of the NSN 4820-00-923-6851 is 4820

Does the NSN 4820-00-923-6851 have a Schedule B code assigned?

Yes, the Schedule B code is 8481909090

Does NSN 4820-00-923-6851 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 4820-00-923-6851 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-00-923-6851 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 4820-00-923-6851 was assigned to the Federal Catalog?

It was assigned 60 years ago, on Thu, Jan 20, 1966