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DevicesEther ValvesLubricatorsSilencersStartersValvesY-StrainersBelts, Pulleys, & Vibration DampersBelts, Pulleys, & Vibration DampersEngine BeltsEngine PulleysEngine Vibration DampersOther Belts, Pulleys, & Vibrational DampersCooling SystemCooling SystemAftercoolers & ComponentsCooling FabricationsCooling ModulesFans & ComponentsHeat ExchangersOil CoolersOther Cooling System ComponentsRadiator & ComponentsTanks & ComponentsThermostatsWater Pumps & ComponentsEngine ComponentsEngine ComponentsAir Compressors & ComponentsCamshaft KitsCamshaftsCylinder Heads & ComponentsEngine BearingsEngine CoversEngine Mounts & SupportsEngine Rotating ComponentsPistons & Other Piston ComponentsEngine Filters & FluidsEngine Filters & FluidsEngine FiltersEngine FluidsEngine Repair & Service KitsEngine Overhaul KitsEngine Overhaul KitsOn-HighwayEngine TransmissionEngines & BlocksEngines & BlocksBare BlocksCylinder Block ComponentsCylinder BlocksEnginesLong BlocksOther Engine ArrangementsShort BlocksExhaust 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RetainersGround Engaging Tool WashersRock DeflectorsGround Engaging Tool Service Tools & GaugesGround Engaging Tool Service Tools & GaugesGround Engaging Tool GaugesGround Engaging Tool Service ToolsOther Ground Engaging ToolsOther Ground Engaging ToolsMulcher TeethWire RopePaving Ground Engaging ToolsPaving Ground Engaging ToolsPaving Cutting BitsPaving Screed PlatesRipper & Scarifier Ground Engaging ToolsRipper & Scarifier Ground Engaging ToolsRipper Shank ProtectorsRipper Shank Repair NosesRipper ShanksRipper TeethScarifier ShanksScarifier TeethRock Drill Ground Engaging ToolsRock Drill Ground Engaging ToolsDown-The-Hole Hammer AdaptersDown-The-Hole Hammer AssembliesDown-The-Hole Hammer BitsTricone Drill BitsTricone Drill NozzlesScraper Ground Engaging ToolsScraper Ground Engaging ToolsScraper Cutting EdgesScraper Elevator & Ejector PartsScraper Router BitsSide Cutters & Sidebar ProtectionSide Cutters & Sidebar ProtectionSide CuttersSidebar Protector Shear BlocksSidebar ProtectorsWing ShroudsWear PlatesWear PlatesBack Drag BarsBase Edge Wear PlatesBucket Rear Wear PlatesHeel PlatesLiner Wear PlatesSidebar Wear PlatesSki PlatesSole PlatesWear ProtectionWear ProtectionBase Edge End ProtectorsBolt SaversChocky BarsHeel ShroudsMechanically Attached Wear Plate System (MAWPS)Roll BarsWear BarsWear BlocksWear ButtonsWear LugsHardware, Seals, & ConsumablesHardware, Seals, & ConsumablesBars, Plates, & Angle BracketsBars, Plates, & Angle BracketsAngle BracketsFlat Common Shape PlatesIrregular PlatesOther Bar, Plates, & Angle BracketsSquare, Hex, & Round BarsBearings & BushingsBearings & BushingsCapsLeg PocketsOther Bearings & BushingsRetainersRing HalfRolling ElementsSleevesSpherical PlainsTrunnionsBelts & PulleysBelts & PulleysBeltsPulleysChannels & TubesChannels & TubesStandard ChannelsStructural TubesU-ChannelsFoam, Insulation, & LinersFoam, Insulation, & LinersCab InsulationHeat ShieldsInsulation Groups & AssembliesIrregularRoundSquare RectangleTrianglesTubular Exhaust SleevesHandles, Latches, & Hand LeversHandles, Latches, & Hand LeversCab Door HandlesCab Grab HandlesCab Hand LeversCab LatchesHardwareHardwareBumpersClampsFastenersGrommetsHingesIsolation MountsKeysLifting ComponentsLink Brackets & ComponentsOther HardwarePinsRetaining/Snap RingsRod Ends & Control RodsSpherical BallsSpringsWashers & SpacersWire Ropes, Cables, & ChainsHardware KitsHoses & TubesInformation, Messages, & MarkingsInformation, Messages, & MarkingsFilmsOther Identification ComponentsPlatesTagsLinkage Pins & Sleeve BearingsLinkage Pins & Sleeve BearingsFlag Pin Assemblies & ComponentsHeaded PinsKeeper Bar Pins & ComponentsLinkage PinsMultiple OD PinsOther Linkage Pins & Sleeve BearingsOther Pins & Pin AssemblyPlain PinsRetaining Ring PinsSleeve BearingsTapered Fit PinsO-Ring KitsSeals, Gaskets, & O-RingsSeals, Gaskets, & O-RingsBackup RingsBulk SealsD-RingsGasketsKitsLoose Lip PistonsMetal RingsO-RingsOther SealsPress-In-PlaceQuad 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StructuresFire Suppression System & ComponentsFire Suppression System & ComponentsActuatorsControllers & ModulesExtinguishersNozzlesGrease Lubrication SystemsGrease Lubrication SystemsGrease ZerksLube Valves & InjectorsLubrication PumpsGuard Assembly StructuresHeavy Frame & Body FabricationsHeavy Frame & Body FabricationsCompactor WheelsCounterweight & BallastsExternal ROPSGrab, Lift, & Push StructuresMachine FrameOther Heavy FabricationsPayload Carrying StructureTrack FramesTruck Bodies & LinersLight Frame & Body FabricationsLight Frame & Body FabricationsEnclosures & DoorsGrates, Grills, & ScreensHandrailsLaddersLevers & LinksOther Light FabricationsStairwaysStepsTrack FendersTread PlatesWalkways & PlatformsWheel FendersOther Covers & SupportsOther Covers & SupportsCustom SupportsCustom Tubular SupportsMetallic CoversNon-Metallic Covers & SupportsScraper Elevator & Ejector SystemsTanks & ComponentsTanks & ComponentsAir TanksDEF TanksFuel TanksGaugesOther Tank ComponentsPressure CapsWashdown TanksWasher Fluid TanksUndercarriageUndercarriageBogiesBogiesBogiesPin Assembly and CartridgesGuardsRolling ComponentsRolling ComponentsBottom RollersCarrier Roller GroupsCarrier Roller Rim AssembliesCast and Forged IdlersCollarsFabricated Idler ComponentsFront Idler GroupsIdler AssembliesIdler GroupsMiscellaneous Rolling ComponentsMounting Caps, Blocks, and Bearing MountsRimsShaftsSlidersSprockets and SegmentsTrack Roller GroupsTrack Roller Rim AssembliesRubber Track Undercarriage ComponentsRubber Track Undercarriage ComponentsIdlersMiscellaneous ComponentsMulti Terrain LoaderRollersSprocketsRubber TracksSealsSealsBackup Rings and Rectangular SealsDuo Cone GroupsO-RingsRingsToric RingsStructuresStructuresFrame AssembliesPlates and BracketsTrack AdjustmentTrack AdjustmentEqualizer PartsRecoil Groups and PartsTrack Tensioner and Adjuster ComponentsTrack ComponentsTrack ComponentsBearing SleevesCartridge AssemblyInsertsLink AssembliesMiscellaneous Track ComponentsTrack Group 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PartsAttachmentsAttachmentsAdaptersAugersBackhoesBale GrabsBale SpearsBladesBroomsBrushcuttersBuckets - BackhoeBuckets - Compact Wheel LoaderBuckets - Medium Wheel LoaderBuckets - Mini Hydraulic Excavator (0 - 10T)Buckets - Skid Steer LoaderBuckets - Small Wheel LoaderCold PlanersCompactorsCouplersFlail MowersForksGrappleHammersHammersHammer BracketsHammer LinesHammer ToolsHammersMaterial Handling ArmsMulchersRakesRippersSawsSmart Grader BladesSnow BlowersSnow PlowsSnow PushesCabsCabsAlarms & HornsAlarms & HornsAlarmsHornsCab AssembliesCab CanopiesCab Displays & GaugesCab Displays & GaugesCab DisplaysCab Gauge ClustersGaugesCab DoorsCab DoorsCab Door AssembliesCab Door HandlesCab Grab HandlesCab Hand LeversCab LatchesCab Entertainment SystemsCab Entertainment SystemsAntennaPower SocketsRadio AccessoriesRadiosSpeakers & GrillsUSB PortsCab HVAC SystemsCab HVAC SystemsCab Accumulators, Receivers, & DryersCab Air Conditioning AssembliesCab Air Conditioning CompressorsCab Air FiltersCab BlowersCab DuctingCab EvaporatorsCab ThermostatsLouversOther Cab HVAC ComponentsCab InteriorCab InteriorCab Dash & TrimsCab Emergency Exit ComponentsCab FloormatsCab InsulationCab Seats & ComponentsCab StorageCab SecurityCab VisibilityCab VisibilityMirrorsOther Visibility ComponentsOther Window & Glass ComponentsShadesVision SystemsVisorsWasher Fluid TanksWindows & GlassWindshield Wipers, Washers, & ComponentsCab Windows & Panel Weatherstrips & SealsCab Windows & Panel Weatherstrips & SealsWeatherstripsWindow & Panel SealsElectric Cab Operator ControlsElectric Cab Operator ControlsCab Buttons & KnobsCab SwitchesCamerasHVACJoystick ComponentsJoysticksKeypadsOther Cab ControlsRotary & Jog Dial ModulesStalksWiper SwitchesMechanical Cab Operator ControlsMechanical Cab Operator ControlsFoot PedalsMechanical Control LeversOther Operator Control ComponentsSteering WheelsOther Cab ComponentsTelematicsDrivetrainDrivetrainAxles & ComponentsAxles & ComponentsAxle ComponentsAxlesBrakes & ComponentsBrakes & ComponentsBrake DrumsBrake HubsBrake LiningsBrake Master CylindersBrake Reservoir TanksBrake Shoe AssembliesBrakesCamshaftsHydraulic Brake ValvesOther Brake ComponentsParking Brake DiscsClutches & ComponentsClutches & ComponentsClutch HousingClutch PlatesClutch-Brake HubClutchesDifferentialsDifferentialsDifferential Bearing KitsDifferential BearingsDifferential CarriersDifferential Case & Housing AssembliesDifferential CasesDifferential Friction DiscsDifferential GearsDifferential GroupsDifferential PlatesDifferential SpidersOther Differential ComponentsDrive Chains & SprocketsDrive Chains & SprocketsDrive ChainsDrive SprocketsDriveshafts & JointsDriveshafts & JointsDriveshaft PlatesDriveshaftsJointsOther Driveshaft & Joint ComponentsDrivetrain Filters & FluidsDrivetrain Filters & FluidsDrivetrain FiltersDrivetrain FluidsDrivetrain Repair & Service KitsDrivetrain Repair & Service KitsDrivetrain & Steering KitsDrivetrain Bearing KitsDrivetrain Gasket KitsFinal DriveFinal DriveFinal Drive Bearing KitsFinal Drive BearingsFinal Drive Damper PlatesFinal Drive Duo Cone SealsFinal Drive GearsFinal Drive PlatesFinal DrivesFriction DiscsOther Final Drive ComponentsGearsGearsOther GearsPlanet GearsPump GearsRing GearsSun GearsOther Drivetrain ComponentsOther Drivetrain ComponentsAdapters & CouplingsDrive GroupsDrivetrain Friction DiscsDrivetrain Pump ValvesDrivetrain Separator PlatesDrivetrain Shafts & Shaft AssembliesDrivetrain Structural ComponentsOther Drivetrain ComponentsSteeringSteeringOther Steering ComponentsSteering Friction DiscsSteering PlatesTires & RimsTires & RimsMounting DiscsMudflapsRim ComponentsRimsTire & Tire ComponentsTorque Converters & ComponentsTorque Converters & ComponentsTorque Converter BearingsTorque Converter ComponentsTorque ConvertersTransmissions & ComponentsTransmissions & ComponentsOther Transmission ComponentsTransmission ArrangementsTransmission Bearing KitsTransmission BearingsTransmission Cases & AssembliesTransmission Friction DiscsTransmission Gasket KitsTransmission GearsTransmission PlatesTransmission RotorWheelsYokes & Yoke AssembliesYokes & Yoke AssembliesYoke AssembliesYokesElectrical & ElectronicsElectrical & ElectronicsAlarms & HornsAlarms & HornsAlarmsHornsBasic ComponentsBasic ComponentsAlternatorsBus BarsCapacitorsCircuit Breakers & FusesCoilsDiodesGeneratorsHeat SinksMotorsRectifiersRegulatorsRelayResistorsSolenoidsStartersTransducersBatteriesBatteriesBattery ComponentsGeneral DutyHeavy DutyOther BatteriesUninterruptible Power SupplyCab Displays & GaugesCab Displays & GaugesCab DisplaysCab Gauge ClustersCab GaugesCab Entertainment SystemsCab Entertainment SystemsAntennaPower SocketRadio AccessoriesRadiosSpeaker & GrillUSB PortCondition MonitoringElectric BoxesElectrical & Electronics Repair & Service KitsElectrical Operator ControlsElectrical Operator ControlsCab Buttons & KnobsCab SwitchesCamerasHVACJoystick ComponentsJoysticksKeypadsOther Cab ControlsRotary & Jog Dial ModulesStalksTransmission Hoist LeversWiper SwitchesHeatersLights & Light AccessoriesLights & Light AccessoriesLight AccessoriesLightsOther Electrical & Electronics ComponentsPowerPowerAlternatorsBatteriesGeneratorsMemory Cards & HDsMotorsOther Power Converter ComponentsPower ControlsPower InvertersSoftwareStartersTransformersRadios & Radio AccessoriesRadios & Radio AccessoriesRadio AccessoriesRadiosSensors & SwitchesSensors & SwitchesAdvanced SensorsEmission SensorsLidarLiquid Level SensorsOther Sensors & SwitchesPosition SensorsPressure SensorsPressure SwitchesRadarSensor & Switch ComponentsSpeed & Timing SensorsTelematicsTemperature SensorsTemperature SwitchesTelematicsTerminal BlocksVision SystemsWiring Harnesses & CablesWiring Harnesses & CablesBulk MaterialsCable AssembliesConduitsConnectorsHarness AssembliesOther Connectors & TerminalsOther Wiring Harnesses & CablesTerminalsWiring GroupsEngineEngineAir & Hydraulic Starting SystemsAir & Hydraulic Starting SystemsBarring DevicesEther ValvesLubricatorsSilencersStartersValvesY-StrainersBelts, Pulleys, & Vibration DampersBelts, Pulleys, & Vibration DampersEngine BeltsEngine PulleysEngine Vibration DampersOther Belts, Pulleys, & Vibrational DampersCooling SystemCooling SystemAftercoolers & ComponentsCooling FabricationsCooling ModulesFans & ComponentsHeat ExchangersOil CoolersOther Cooling System ComponentsRadiator & ComponentsTanks & ComponentsThermostatsWater Pumps & ComponentsEngine ComponentsEngine ComponentsAir Compressors & ComponentsCamshaft KitsCamshaftsCylinder Heads & ComponentsEngine BearingsEngine CoversEngine Mounts & SupportsEngine Rotating ComponentsPistons & Other Piston ComponentsEngine Filters & FluidsEngine Filters & FluidsEngine FiltersEngine FluidsEngine Repair & Service KitsEngine Overhaul KitsEngine Overhaul KitsOn-HighwayEngine TransmissionEngines & BlocksEngines & BlocksBare BlocksCylinder Block ComponentsCylinder BlocksEnginesLong BlocksOther Engine ArrangementsShort BlocksExhaust SystemExhaust SystemAftertreatment Systems & ComponentsExhaust AirLinesExhaust BellowsExhaust Manifolds & Manifold ComponentsExhaust PipesExhaust TubingExhaust ValvesIntake ComponentsMufflersOther Exhaust System ComponentsWastegateFEAD & Housing SystemsFEAD & Housing SystemsCrankshaft AdaptersFEAD & Fan Drive BracketsFan AdaptersFan Drive GroupsFront & Rear HousingsPump & Auxiliary AdaptersFuel SystemFuel SystemActuatorsCarburetors & GovernorsFuel InjectorsFuel Lines/High Pressure LinesFuel PressureFuel PumpsFuel RailsFuel System ValvesFuel TanksInjector NozzlesOther Fuel System ComponentsSeals for Fuel SystemsIgnition/Electrical SystemIgnition/Electrical SystemAlternatorsIgnitionsOil Mist DetectorsSpark PlugsStartersLubrication SystemLubrication SystemBreathersClosed Crankcase Ventilation (CCV)Disposal & OCV LinesOil FillsOil LinesOil PansOil Pump ComponentsOil PumpsOil Renewal System Valve AssemblyOther Lubrication ComponentsRegulatorsTurbo SystemTurbo SystemDiffusers & NozzlesHousings & CoversOther Turbo ComponentsTurbo CartridgesTurbochargers & Turbocharger GroupsValve TrainValve TrainActuatorsBridgeCamshaft KitsCamshaftsEngine BrakesLifter ShaftOther Valve ComponentsOther Valve Mechanism ComponentsPushrodsRocker ArmsRotocoilsValvesFilters & FluidsFilters & FluidsFiltersFiltersAftertreatment/DEFAir CleanersAir FiltersBreathersCoolant ConditionersEngine Oil Filters & ComponentsFuel Filters & Fuel Water SeparatorsHydraulic & Transmission FiltersLube System FiltersOther Filters & Filter ComponentsScreensFluidsFluidsAftertreatment/Diesel Exhaust Fluid (DEF)CoolantsGreasesOilsGround Engaging ToolsGround Engaging ToolsBlade Cutting Edges & End BitsBlade Cutting Edges & End BitsBlade End BitsBox Blade Cutting EdgesBucket Base Edges & LipsBucket Base Edges & LipsBase Edge AssembliesBase EdgesCast LipsBucket Corners & Corner GuardsBucket Corners & Corner GuardsBucket Corner GuardsBucket CornersBucket Cutting Edges & Edge ProtectionBucket Cutting Edges & Edge 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BackHomeGround Engaging ToolsGround Engaging Tool Hardware & RetentionGround Engaging Tool Washers8T-4121: M10 ID Steel Flat Washer
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8T-4121: M10 ID Steel Flat Washer
8T-4121: M10 ID Steel Flat Washer
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8T-4121: M10 ID Steel Flat Washer
8T-4121: M10 ID Steel Flat Washer
8T-4121: M10 ID Steel Flat Washer
8T-4121: M10 ID Steel Flat Washer
8T-4121: M10 ID Steel Flat Washer

Cat®Flat Washer (Clutch,Brake,Transmission)

Brand: Cat

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Warranty Information
Warranty Information

Generally, warranty for parts purchased on Parts.Cat.Com is 12 months from the invoice date as defined in the Caterpillar Limited Warranty. Parts Warranty covers defects in material and workmanship throughout the Warranty period once it has been installed. For complete Warranty detail contact your local Cat Dealer.

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Return Policy
Return Policy Information
Unless otherwise noted by a non-returnable part
icon, most parts can be returned to your authorized Cat® dealer under their return policy.

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Find a DealerEmail
Warranty Information
Warranty Information

Generally, warranty for parts purchased on Parts.Cat.Com is 12 months from the invoice date as defined in the Caterpillar Limited Warranty. Parts Warranty covers defects in material and workmanship throughout the Warranty period once it has been installed. For complete Warranty detail contact your local Cat Dealer.

Need More Help? Contact Us

Find a DealerEmail
Return Policy
Return Policy Information
Unless otherwise noted by a non-returnable part
icon, most parts can be returned to your authorized Cat® dealer under their return policy.

Need More Help? Contact Us

Find a DealerEmail
Parts diagram for 8T-4121
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Description for part number 8T-4121

Description:
Cat® fastener parts are designed for specific applications based on size, strength, clamp load, and past performance. This is information other manufacturers do not have. They are selected to last until rebuild or the life of the machine. While it may seem as though non-Cat hardware and fasteners are suitable for your machine, no other company knows your equipment like we do. Cat Fasteners are manufactured to precise specifications and are built for durability, reliability, productivity. Strength & Quality – Fasteners meet or exceed ISO, ASTM, ASME & SAE requirements. Cat bolts, nuts, and washers are designed to work together as a system for maximum clamping force. Coatings that meet special requirements for different applications (RoHS compliant). Cat bolts and the matching washers and nuts form a performance based system which produces consistently high clamp loads. You can trust Cat Fasteners to help you build it, maintain it, or fix it - for most machine and workshop applications throughout the world.

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Warning:This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications for part number 8T-4121

Units of Measure

USMetric

Material: Alloy Zinc,HARDENED STEEL,Low Alloy Steel

Washer Type: Flat

Fits Bolt Sizes (in): 3/8

Fits Bolt Sizes (mm): M10

Material Description: Hardened Steel

Coating: Zinc Flake-Black

Inner Diameter (in): 0.433

Inner Diameter (mm): 11

Outer Diameter (in): 0.827

Outer Diameter (mm): 21

Thickness (in): 0.098

Thickness (mm): 2.5

Thickness - 3 (mm): 2.5

Inside Diameter (mm): 11

Hardened: Yes

Inside Diameter (in): 0.433

Outside Diameter (in): 0.827

Outside Diameter (mm): 21

Outside Diameter (OD) - 2 (mm): 21

Finish Notes: Caterpillar is changing from Zinc Plating to a Zinc Flake finish for many washers. The new coating improves corrosion protection to 720 hours. Until stock of the current finish is depleted, you may receive either finish due to the exhaust process.

Inside Diameter (ID) - 1 (mm): 11

Finish: Zinc Flake

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Compatible Models for part number 8T-4121

GENERATOR

SR4 SR4BHV

TRUCK ENGINE

C-10 3176 3126B 3306 1673C 3208 3406C 3406B 3176B 3116 3126 3306B

INTEGRATED TOOLCARRIER

IT18B IT12B IT14G IT28G IT28F IT28B

WHEEL SKIDDER

525 518

RETROFIT AFTERTREATMNT

DOC SCR

TRACK FELLER BUNCHER

TK751 1190 1390 1190T 1090

HARVESTER HEAD

HH45 HH55 HH75

RENEWABLE ENERGY

PGS1260 HD

EXCAVATOR

320-A L 323F SA 320-A N 321B 350-A L 350 L M325D MH 320-A 320N 375-A 245B M312 M315 M318 320 L M325D L MH

MULTI TERRAIN LOADER

257B 247B

COMPACT TRACK LOADER

259D

WHEEL TRACTOR

631E 621E 637E

MULTI PROCESSOR

VT30 VT40 MP20 MP15

HYDRAULIC CONTROL

48

TRACK LOADER

963 973 943 953 953C

PETROLEUM ENGINE

C280-12

BACKHOE LOADER

426B 438C 438D 426C 438B 416 424D 426 436C 428 424B 446B 420D 432D 420F 442D 430D 430F 438 436 416C 428D 416D 428B 416B 428C

WHEEL DOZER

834B

MULCHING HEAD

HM518

COMPACT WHEEL LOADER

908 910F 910E 914G

WHEEL LOADER

928G 972G 960F 972H 988 XE 928HZ 950B 950E 950G 950F 962G G926 916 G916 926 936 966D 966E 966H 966G 930H 982 XE 930R 930T 980 XE 950B/950E 924GZ 924HZ 936E 924G 980C 980F 980H 928F 938G 926E 970F

TELEHANDLER

RT80 TH337C TH82 TH83 TH103 TH336C TH407C RT100 TH62 TH63 TH350B TH414C TH406C TH255C TH514C TH417C

SOIL STABILIZER

SS-250

ARTICULATED TRUCK

D30D D300B D250B D25D D300E II

GRAPPLE-LOG LOADING

GLL55 GLL52 GLL60

TRENCHER

T9B

WHEELED EXCAVATOR

M318C M322C M318C MH M315C M316C M313C

ENGINE - INDUSTRIAL

3406B 3406C

PNEUMATIC COMPACTOR

PF-300B PS-300B

INDUSTRIAL ENGINE

3516B 3406C 3304 3306 3412 D333C 3406 3512 3412E 3516 3508 C15 D330C

ASPHALT SCREED

AS2252C 8 FT

WHEEL SCRAPER

631E 633E 621F 657B 623F 623E 637E 613C 627F 657

QUARRY TRUCK

775B 771D 771C

GAS ENGINE

G3306 G3612 G3606

TRACTOR

776B 768C 772B

BULLDOZER

7SU 7S LGP 6S 7S 4A

PUMPER

CPT372

UNDERGROUND ART TRUCK

AE40 AD45B AD55 AD30 AE40 II AD45 AD40

FELLING HEAD

HF222 HF221 HF202 HF201 HF181

POWER MODULE

PM3456

LOAD HAUL DUMP

R1600 R1700G R2900 R1700 II R2900G R1300

MOTOR GRADER

120H 120G 140G 16G 130G 14G 12G 160G

TRACK-TYPE TRACTOR

D6H XL D6H II D4G D4H D4E D5H D6D D7G2 D6E D6H D7G D7H D6 D5 D6G2 XL D4E SR

ASPHALT PAVER

AP-800 AP-800B BG-210B AP-200

MARINE AUXILIARY

C32

MARINE ENGINE

3516 3512 3508 C18 3056 3408B 3408C 3406B 3126 C280-16 C175-16 3208 3304 3412E 3304B 3412 C280-6 C280-8

STABILIZER MIXER

SM-350

SHEAR-DEMOLITION/SCRAP

S320 VHS-30

VIBRATORY COMPACTOR

CS-323 CS-563 CP-563 CP-323 CB-434B CB-434 CB-614

GENERATOR SET

C32 3406C

BOX BLADE

BB121 BB124

RECLAIMER MIXER

RM-350

LOCOMOTIVE ENGINE

3516C

COLD PLANER

PR-1000 PR-1000C PM-565

ROAD RECLAIMER

RR-250

ENGINE - MACHINE

3116 3208 C9

CHALLENGER

55 70C 65 65C 65B 65D 75C 85C 35 45

GEN SET ENGINE

3406C 3406B 3408B 3408C 3304B 3306 3304 3412 3208 3412C 3508 3408 3512 3516

RIPPER

7

ROTARY/TRACK DRILLS

MD6640 MD6540

SKID STEER LOADER

226B 216B 236 248 246 252B 216 242B 228 226 232B 236B

WHEEL FELLER BUNCHER

533

TRUCK

785 69D 773D 794 AC 773B 793F OEM 775D 769D 769C

ACCESS PLATFORM

THP24S II

View More
DiagramDescriptionSpecificationsCompatible Models
Parts diagram for 8T-4121
View Detailed Parts Diagrams
Add Your Equipment
Description for part number 8T-4121

Description:
Cat® fastener parts are designed for specific applications based on size, strength, clamp load, and past performance. This is information other manufacturers do not have. They are selected to last until rebuild or the life of the machine. While it may seem as though non-Cat hardware and fasteners are suitable for your machine, no other company knows your equipment like we do. Cat Fasteners are manufactured to precise specifications and are built for durability, reliability, productivity. Strength & Quality – Fasteners meet or exceed ISO, ASTM, ASME & SAE requirements. Cat bolts, nuts, and washers are designed to work together as a system for maximum clamping force. Coatings that meet special requirements for different applications (RoHS compliant). Cat bolts and the matching washers and nuts form a performance based system which produces consistently high clamp loads. You can trust Cat Fasteners to help you build it, maintain it, or fix it - for most machine and workshop applications throughout the world.

View More
Warning:This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications for part number 8T-4121

Units of Measure

USMetric

Material: Alloy Zinc,HARDENED STEEL,Low Alloy Steel

Washer Type: Flat

Fits Bolt Sizes (in): 3/8

Fits Bolt Sizes (mm): M10

Material Description: Hardened Steel

Coating: Zinc Flake-Black

Inner Diameter (in): 0.433

Inner Diameter (mm): 11

Outer Diameter (in): 0.827

Outer Diameter (mm): 21

Thickness (in): 0.098

Thickness (mm): 2.5

Thickness - 3 (mm): 2.5

Inside Diameter (mm): 11

Hardened: Yes

Inside Diameter (in): 0.433

Outside Diameter (in): 0.827

Outside Diameter (mm): 21

Outside Diameter (OD) - 2 (mm): 21

Finish Notes: Caterpillar is changing from Zinc Plating to a Zinc Flake finish for many washers. The new coating improves corrosion protection to 720 hours. Until stock of the current finish is depleted, you may receive either finish due to the exhaust process.

Inside Diameter (ID) - 1 (mm): 11

Finish: Zinc Flake

View More
Compatible Models for part number 8T-4121

GENERATOR

SR4 SR4BHV

TRUCK ENGINE

C-10 3176 3126B 3306 1673C 3208 3406C 3406B 3176B 3116 3126 3306B

INTEGRATED TOOLCARRIER

IT18B IT12B IT14G IT28G IT28F IT28B

WHEEL SKIDDER

525 518

RETROFIT AFTERTREATMNT

DOC SCR

TRACK FELLER BUNCHER

TK751 1190 1390 1190T 1090

HARVESTER HEAD

HH45 HH55 HH75

RENEWABLE ENERGY

PGS1260 HD

EXCAVATOR

320-A L 323F SA 320-A N 321B 350-A L 350 L M325D MH 320-A 320N 375-A 245B M312 M315 M318 320 L M325D L MH

MULTI TERRAIN LOADER

257B 247B

COMPACT TRACK LOADER

259D

WHEEL TRACTOR

631E 621E 637E

MULTI PROCESSOR

VT30 VT40 MP20 MP15

HYDRAULIC CONTROL

48

TRACK LOADER

963 973 943 953 953C

PETROLEUM ENGINE

C280-12

BACKHOE LOADER

426B 438C 438D 426C 438B 416 424D 426 436C 428 424B 446B 420D 432D 420F 442D 430D 430F 438 436 416C 428D 416D 428B 416B 428C

WHEEL DOZER

834B

MULCHING HEAD

HM518

COMPACT WHEEL LOADER

908 910F 910E 914G

WHEEL LOADER

928G 972G 960F 972H 988 XE 928HZ 950B 950E 950G 950F 962G G926 916 G916 926 936 966D 966E 966H 966G 930H 982 XE 930R 930T 980 XE 950B/950E 924GZ 924HZ 936E 924G 980C 980F 980H 928F 938G 926E 970F

TELEHANDLER

RT80 TH337C TH82 TH83 TH103 TH336C TH407C RT100 TH62 TH63 TH350B TH414C TH406C TH255C TH514C TH417C

SOIL STABILIZER

SS-250

ARTICULATED TRUCK

D30D D300B D250B D25D D300E II

GRAPPLE-LOG LOADING

GLL55 GLL52 GLL60

TRENCHER

T9B

WHEELED EXCAVATOR

M318C M322C M318C MH M315C M316C M313C

ENGINE - INDUSTRIAL

3406B 3406C

PNEUMATIC COMPACTOR

PF-300B PS-300B

INDUSTRIAL ENGINE

3516B 3406C 3304 3306 3412 D333C 3406 3512 3412E 3516 3508 C15 D330C

ASPHALT SCREED

AS2252C 8 FT

WHEEL SCRAPER

631E 633E 621F 657B 623F 623E 637E 613C 627F 657

QUARRY TRUCK

775B 771D 771C

GAS ENGINE

G3306 G3612 G3606

TRACTOR

776B 768C 772B

BULLDOZER

7SU 7S LGP 6S 7S 4A

PUMPER

CPT372

UNDERGROUND ART TRUCK

AE40 AD45B AD55 AD30 AE40 II AD45 AD40

FELLING HEAD

HF222 HF221 HF202 HF201 HF181

POWER MODULE

PM3456

LOAD HAUL DUMP

R1600 R1700G R2900 R1700 II R2900G R1300

MOTOR GRADER

120H 120G 140G 16G 130G 14G 12G 160G

TRACK-TYPE TRACTOR

D6H XL D6H II D4G D4H D4E D5H D6D D7G2 D6E D6H D7G D7H D6 D5 D6G2 XL D4E SR

ASPHALT PAVER

AP-800 AP-800B BG-210B AP-200

MARINE AUXILIARY

C32

MARINE ENGINE

3516 3512 3508 C18 3056 3408B 3408C 3406B 3126 C280-16 C175-16 3208 3304 3412E 3304B 3412 C280-6 C280-8

STABILIZER MIXER

SM-350

SHEAR-DEMOLITION/SCRAP

S320 VHS-30

VIBRATORY COMPACTOR

CS-323 CS-563 CP-563 CP-323 CB-434B CB-434 CB-614

GENERATOR SET

C32 3406C

BOX BLADE

BB121 BB124

RECLAIMER MIXER

RM-350

LOCOMOTIVE ENGINE

3516C

COLD PLANER

PR-1000 PR-1000C PM-565

ROAD RECLAIMER

RR-250

ENGINE - MACHINE

3116 3208 C9

CHALLENGER

55 70C 65 65C 65B 65D 75C 85C 35 45

GEN SET ENGINE

3406C 3406B 3408B 3408C 3304B 3306 3304 3412 3208 3412C 3508 3408 3512 3516

RIPPER

7

ROTARY/TRACK DRILLS

MD6640 MD6540

SKID STEER LOADER

226B 216B 236 248 246 252B 216 242B 228 226 232B 236B

WHEEL FELLER BUNCHER

533

TRUCK

785 69D 773D 794 AC 773B 793F OEM 775D 769D 769C

ACCESS PLATFORM

THP24S II

View More
Compare Alternate Parts
8T-4121
This part:
8T-4121: M10 ID Steel Flat Washer
Fits Bolt Sizes (in)

3/8

Inner Diameter (in)

0.433

Outer Diameter (in)

0.827

Description

Cat®Flat Washer (Clutch,Brake,Transmission)

606-0849
This part:
606-0849: Washer Kit - Small Sizes
Fits Bolt Sizes (in)

5/16, 3/8, 1/2

Description

Washer Kit: 6 Sizes, 6 Assorted Thicknesses, 9 Part Numbers, 150 Pieces, Hard Washers, Zinc Flake Coating

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8T-4172: M10-1.5 x 80mm Hex Head Bolt
8T-4172: M10-1.5 x 80mm Hex Head Bolt

Track Bolt

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8T-0389: M10 x 1.5mm Hex Lock Nut
8T-0389: M10 x 1.5mm Hex Lock Nut

Cat® M10 Steel Hexagonal Lock Nut with Nylon Insert

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KeyKey
Factory Fit

This part is designed to fit your Cat equipment based on the manufacturer’s specifications.

Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.

Remanufactured

Non-Returnable

Kit

Replaced

Remanufactured

Non-Returnable

Kit

Replaced

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