Model: C581

Engine Poppet Valve

Properties:

Head Style
Flat
Head Height
Between 0.1960 inches and 0.2060 inches
Chamfer Angle In Deg
45.0
Chamfer Length
0.0300 inches
Taper Angle In Deg
15.0
Outside Diameter
Between 1.5625 inches and 1.5725 inches
Minor Outside Diameter
Between 0.2450 inches and 0.2490 inches
Minor Diameter Length
0.1900 inches
Seat Angle In Deg
45.0
Stem Style
Tapered
Carbon Relief Groove
Not included
Neck Radius
0.4700 inches
Stem Length
Between 4.8070 inches and 4.8170 inches
Stem Diameter
Between 0.3720 inches and 0.3730 inches
Distance From Minor Diameter To Stem End
Between 0.2170 inches and 0.2190 inches
Material And Location
Cobalt alloy seat face
Material And Location
Steel, federal standard 66, aisi/sae 8645 stem
Material And Location
Steel, federal standard 66, sae ev4 head
Fsc Application Data
Gasoline engine
NSN
2805-00-386-3381
Part Number
C581
Description
Valve,poppet,engine
CAGE

A mushroom or tulip-shaped item having a circular head with a conical face and an extended stem used to regulate the flow of incoming fuel-air mixture or air into the combustion chamber or exhaust gases from the combustion chamber of a reciprocating internal combustion engine.

Part C581 NSN 2805-00-386-3381

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
15884
FIIG:
A11200
Concept No.:
1
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: 8409918000
  • SITC: 71391
  • End Use: Industrial engines
  • NAICS: 333618
  • USDA: 1

Freight Class: Parts for spark-ignition internal combustion piston engines, nesoi

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