Model: 254

Valve Seat

Properties:

Thread Class

2a single threaded portion

Thread Length

0.250 inches single threaded portion

Flange Diameter

1.750 inches

Body Inside Diameter

1.313 inches

Flange Seat To Disk End Height

0.375 inches

Under Flange Height

Between 0.250 inches and 0.251 inches

Thready Qty Per Inch (tpi)

16 single threaded portion

Thread Size

0.625 inches single threaded portion

Seating Surface Shape

Flat

Material

Copper alloy

Style Designator

Threaded flanged

Thread Series Designator

Un single threaded portion

NSN

4820-00-074-7991

Part Number

254

Description

Seat,valve

CAGE

55378

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 254 NSN 4820-00-074-7991

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