Model: 21900

Valve Seat

Properties:

Flange Diameter

Between 0.373 inches and 0.374 inches

Body Outside Diameter

Between 0.260 inches and 0.262 inches

Body Inside Diameter

Between 0.156 inches and 0.157 inches

Flange Seat To Disk End Height

Between 0.069 inches and 0.070 inches

Under Flange Height

0.085 inches

Hardness Rating

31.0 rockwell c and 38.0 rockwell c

Seating Surface Shape

Flat

Material

Steel comp 410

Material Specification

Qq-s-763 federal specification single material response

Surface Treatment

Passivate

Surface Treatment Specification

Mil-171 military standard single treatment response

Style Designator

Plain flanged

Fsc Application Data

Valve, reset, powered

NSN

4810-01-049-2384

Part Number

21900

Description

Seat,valve

CAGE

16780

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 21900 NSN 4810-01-049-2384

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

22113

FIIG:

A15500

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

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:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

051080

UFC:

29300

LTL:

RATING VARIABLE

LCL:

WCC:

576

TCC:

SHC:

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