Model: 20489-38

Lock Washer

Properties:

Hole Diameter

Between 0.168 inches and 0.176 inches

Outside Diameter

Between 0.325 inches and 0.336 inches

Material Thickness

Between 0.018 inches and 0.022 inches

Material

Copper alloy

Surface Treatment

Cadmium

Surface Treatment Specification

Qq-p-416, type 2, cl 3 federal specification single treatment response

Style Designator

Flat external teeth

NSN

5310-00-550-3458

Part Number

20489-38

Description

Washer,lock

CAGE

83298

A washer which is usually round with a centrally located hole. Its edges and two bearing surfaces are so designed that applied pressure brings into play the spring tension and/or frictional locking principle which materially resists any tendency toward turning. It may be made of one or two pieces

Part 20489-38 NSN 5310-00-550-3458

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

14218

FIIG:

A022B0

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:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

194120

UFC:

95100

LTL:

RATING VARIABLE

LCL:

70.0

WCC:

713

TCC:

SHC:

ACC:

Trailers/Vehicles

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Schedule B and Export

Schedule B: 7415210000
SITC: 69432
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Copper washers including spring washers not threaded