Model: 6820556-3

Valve Seat

Properties:

Overall Height

Between 0.170 inches and 0.190 inches

Body Outside Diameter

Between 0.661 inches and 0.662 inches

Body Inside Diameter

Between 0.344 inches and 0.346 inches

Seat Radius

0.218 inches

Seating Surface Shape

Radial

Material

Copper alloy

Material Specification

Ams4640 assn standard single material response

Style Designator

Plain

NSN

4820-01-186-4718

Part Number

6820556-3

Description

Seat,valve

CAGE

63005

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.

Part 6820556-3 NSN 4820-01-186-4718

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

22113

FIIG:

A15500

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

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Schedule B and Export

Schedule B: 8481909090
SITC: 74790
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Parts of taps, cocks, valves and similar appliances, nesoi