Model: 42121

Valve Seat

Properties:

Thread Class
2a single threaded portion
Flange Diameter
5.380 inches
Body Inside Diameter
4.000 inches
Flange Seat To Disk End Height
0.375 inches
Under Flange Height
0.965 inches
Seat Angle In Deg
30.000
Thready Qty Per Inch (tpi)
16 single threaded portion
Thread Size
1.250 inches single threaded portion
Seating Surface Shape
Angular
Material
Copper alloy
Style Designator
Threaded flanged
Thread Series Designator
Un single threaded portion
NSN
4820-00-872-5276
Part Number
42121
Description
Seat,valve
CAGE
86184

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 42121 NSN 4820-00-872-5276

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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