Model: 6820556-2

Valve Seat

Properties:

Overall Height
Between 0.170 inches and 0.190 inches
Body Outside Diameter
Between 0.660 inches and 0.661 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
4820-01-186-4717
Part Number
6820556-2
Description
Seat,valve
CAGE

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 6820556-2 NSN 4820-01-186-4717

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
22113
FIIG:
A15500
Concept No.:
App. Key:
A
Cond. Code:
2
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

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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

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