Model: A657

Engine Poppet Valve

Properties:

Head Style
Flat
Head Height
Between 0.1450 inches and 0.1600 inches
Chamfer Angle In Deg
45.0
Chamfer Length
0.0312 inches
Outside Diameter
Between 1.6360 inches and 1.6460 inches
Seat Angle In Deg
30.0
Stem Style
Double grooved
Carbon Relief Groove
Not included
Neck Radius
0.5312 inches
Stem Length
6.1320 inches
Stem Diameter
Between 0.3410 inches and 0.3417 inches
Distance From First Groove To Stem End
0.6880 inches
Distance From Second Groove To Stem End
0.9330 inches
First Groove Diameter
Between 0.3000 inches and 0.3060 inches
Second Groove Diameter
Between 0.3000 inches and 0.3060 inches
First Groove Width
Between 0.0950 inches and 0.1050 inches
Second Groove Width
0.0950 mils and 0.1050 centimeters
Material And Location
Steel, federal standard 66, sae hnv2
Metallic Hardness Rating And Location
42.0 rockwell c tip
Fsc Application Data
Gasoline engine
NSN
2805-00-752-0166
Part Number
A657
Description
Valve,poppet,engine
CAGE
77576

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 A657 NSN 2805-00-752-0166

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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
133300
UFC:
63220
LTL:
RATING VARIABLE
LCL:
--
WCC:
593
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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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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