Model: 11978

Valve Seat

Special Features:

Flange diameter 0.3740 in. Min, flange diameter 0.3745 in. Max

Properties:

Flange Diameter
0.375 inches
Body Outside Diameter
Between 0.250 inches and 0.262 inches
Body Inside Diameter
Between 0.039 inches and 0.040 inches
Flange Seat To Disk End Height
0.095 inches
Under Flange Height
Between 0.080 inches and 0.085 inches
Hardness Rating
55.0 rockwell c body and 60.0 rockwell c body
Seating Surface Shape
Flat
Body Stepped Inside Diameter
0.039 inches second step and 0.040 inches second step
Body Stepped Inside Diameter
0.156 inches first step
Material
Steel
Material Specification
Qq-s-763 440c federal specification single material response
Surface Treatment
Passivate
Style Designator
Plain flanged
NSN
4820-00-723-5783
Part Number
11978
Description
Seat,valve
CAGE
99643

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 11978 NSN 4820-00-723-5783

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:
SX
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:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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