Model: 25-8153-W

Valve Seat

Special Features:

0.375 in. Across flats, 0.156 in. Lg hex wrenching feature flange end; four 0.062 in. Diameter holes 90 degrees apart drilled through body perpendicular to bore between thd portion and flange

Properties:

Thread Class
3a single threaded portion
Thread Length
0.344 inches single threaded portion
Flange Diameter
0.672 inches
Flange Seat To Disk End Height
0.094 inches
Under Flange Height
0.594 inches
Hardness Rating
40.0 rockwell c and 45.0 rockwell c
Thread Size
0.500 inches single threaded portion
Seating Surface Shape
Flat
Body Stepped Inside Diameter
0.201 inches third step
Body Stepped Inside Diameter
0.313 inches first step
Body Stepped Inside Diameter
0.316 inches second step
Material
Steel comp 4140
Style Designator
Threaded flanged
Thread Series Designator
Unf single threaded portion
NSN
4820-01-253-4637
Part Number
25-8153-W
Description
Seat,valve
CAGE
9F512

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 25-8153-W NSN 4820-01-253-4637

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

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
051080
UFC:
29300
LTL:
RATING VARIABLE
LCL:
--
WCC:
594
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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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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