Model: 20645-1

Valve Seat

Properties:

Flange Diameter
Between 0.372 inches and 0.374 inches
Body Outside Diameter
0.250 inches
Body Inside Diameter
0.156 inches
Flange Seat To Disk End Height
0.078 mils and 0.082 centimeters
Under Flange Height
Between 0.285 inches and 0.299 inches
Seat Angle In Deg
30.000
Seating Surface Shape
Angular
Material
Steel comp 440c
Material Specification
Qq-s-763 federal specification single material response
Surface Treatment
Passivate
Surface Treatment Specification
Mil-s-5002 military specification single treatment response
Style Designator
Plain flanged
Fsc Application Data
Aircraft hydraulic system
NSN
4820-01-254-6775
Part Number
20645-1
Description
Seat,valve
CAGE
99167

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 20645-1 NSN 4820-01-254-6775

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:
A
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
133300
UFC:
63220
LTL:
RATING VARIABLE
LCL:
85.0
WCC:
594
TCC:
Z
SHC:
Z
ACC:
Equipment for Aircraft

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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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