{"product_id":"husqvarna-539108366-1-2-13-x-4-grade-5-hex-cap-screw-genuine-oem-replacement-bolt","title":"Husqvarna 539108366 1\/2-13 x 4 Grade 5 Hex Cap Screw – Genuine OEM Replacement Bolt","description":"\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 539108366\u003cbr\u003e\u003cstrong\u003eCategory:\u003c\/strong\u003e Lawn Mower, Outdoor Power Equipment \u0026amp; Replacement Hardware\u003cbr\u003e\u003cstrong\u003eType:\u003c\/strong\u003e 1\/2-13 x 4-Inch Grade 5 Hex Cap Screw – Genuine OEM Replacement Bolt\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eThe \u003cstrong\u003eHusqvarna 539108366 Hex Cap Screw\u003c\/strong\u003e is a genuine OEM replacement fastener designed for select \u003cstrong\u003eHusqvarna lawn mowers, zero-turn mowers, lawn tractors, and compatible outdoor power equipment assemblies\u003c\/strong\u003e. This hardware is specified as a \u003cstrong\u003e1\/2-13 x 4-inch Grade 5 hex cap screw\u003c\/strong\u003e, providing an application-specific fastening solution for equipment requiring Husqvarna part number \u003cstrong\u003e539108366\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 539108366\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Husqvarna\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Hex Cap Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Description:\u003c\/strong\u003e HCS 1\/2-13 x 4 GR 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate Description:\u003c\/strong\u003e Hex Head Cap Screw \/ Hex Bolt \/ Equipment Mounting Bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Diameter:\u003c\/strong\u003e 1\/2 Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Specification:\u003c\/strong\u003e 1\/2-13\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads Per Inch:\u003c\/strong\u003e 13 TPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Length:\u003c\/strong\u003e 4 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e Grade 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard:\u003c\/strong\u003e UNC \/ Coarse Thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Hex Head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Equipment Fastener \/ Mounting Hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e Outdoor Power Equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Model \u0026amp; Assembly Dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Secures Compatible Equipment Components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Brand:\u003c\/strong\u003e Husqvarna\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Model Dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssociated Components:\u003c\/strong\u003e Nuts \/ Washers \/ Brackets \/ Mounting Assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Type:\u003c\/strong\u003e Direct OEM Replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Status:\u003c\/strong\u003e Genuine Husqvarna OEM Part\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Hex Cap Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number Reference:\u003c\/strong\u003e 539108366\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate Number Format:\u003c\/strong\u003e 539 10 83-66\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Husqvarna OEM replacement hardware\u003c\/li\u003e\n\u003cli\u003eFactory-specified \u003cstrong\u003e1\/2-13 x 4-inch\u003c\/strong\u003e configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 5\u003c\/strong\u003e strength classification\u003c\/li\u003e\n\u003cli\u003eStandard coarse-thread design\u003c\/li\u003e\n\u003cli\u003e13 threads per inch\u003c\/li\u003e\n\u003cli\u003eHex-head configuration for conventional tool engagement\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible Husqvarna equipment assemblies\u003c\/li\u003e\n\u003cli\u003eProvides secure mechanical fastening\u003c\/li\u003e\n\u003cli\u003eApplication-specific OEM replacement\u003c\/li\u003e\n\u003cli\u003eSuitable for equipment repair, servicing, and restoration\u003c\/li\u003e\n\u003cli\u003eAppropriate replacement for bent, stripped, corroded, or missing hardware\u003c\/li\u003e\n\u003cli\u003eMaintains the original equipment fastener specification\u003c\/li\u003e\n\u003cli\u003eDirect replacement for applications specifying \u003cstrong\u003e539108366\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e1\/2-13 Thread Specification\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539108366\u003c\/strong\u003e uses a \u003cstrong\u003e1\/2-13 thread specification\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis designation means:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2 Inch:\u003c\/strong\u003e Nominal outside thread diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13:\u003c\/strong\u003e Number of threads per inch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 1\/2-13 configuration is a coarse-thread specification commonly used for mechanical fastening applications.\u003c\/p\u003e\n\u003cp\u003eThe mating nut or threaded component must use the same \u003cstrong\u003e1\/2-13 thread pattern\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eA fine-thread 1\/2-inch fastener should not be substituted simply because the nominal diameter is the same.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e4-Inch Nominal Length\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539108366\u003c\/strong\u003e has a nominal fastener length of \u003cstrong\u003e4 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eCorrect bolt length is important because an improperly sized fastener may:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFail to provide sufficient thread engagement\u003c\/li\u003e\n\u003cli\u003eExtend too far through an assembly\u003c\/li\u003e\n\u003cli\u003eContact surrounding components\u003c\/li\u003e\n\u003cli\u003eInterfere with moving parts\u003c\/li\u003e\n\u003cli\u003ePrevent correct installation\u003c\/li\u003e\n\u003cli\u003eAlter the clamping arrangement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor equipment specifying \u003cstrong\u003e539108366\u003c\/strong\u003e, use the OEM part number as the primary replacement reference.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGrade 5 Fastener\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539108366\u003c\/strong\u003e is specified as a \u003cstrong\u003eGrade 5\u003c\/strong\u003e fastener.\u003c\/p\u003e\n\u003cp\u003eSAE Grade 5 bolts are commonly identified as medium-strength carbon-steel fasteners intended for mechanical applications requiring greater strength than standard low-strength hardware.\u003c\/p\u003e\n\u003cp\u003eThe grade specification is important because fasteners that look physically similar can have different mechanical properties.\u003c\/p\u003e\n\u003cp\u003eDo not substitute a lower-strength bolt simply because its diameter, thread pitch, and length match.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eHex Head Design\u003c\/h2\u003e\n\u003cp\u003eThe hexagonal head allows the fastener to be installed or removed using an appropriately sized:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSocket\u003c\/li\u003e\n\u003cli\u003eRatchet\u003c\/li\u003e\n\u003cli\u003eWrench\u003c\/li\u003e\n\u003cli\u003eTorque wrench\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsing the correct tool size helps reduce the possibility of rounding or damaging the bolt head.\u003c\/p\u003e\n\u003cp\u003eAvoid using worn or incorrectly sized tools when removing tightly installed equipment hardware.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eEquipment Applications\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539108366\u003c\/strong\u003e is used on select Husqvarna outdoor power equipment assemblies.\u003c\/p\u003e\n\u003cp\u003eDepending on the exact model, a fastener of this type may be associated with structural, chassis, suspension, steering, deck, or other mechanical assemblies.\u003c\/p\u003e\n\u003cp\u003eBecause the installation location varies by equipment model, compatibility should be determined using the \u003cstrong\u003epart number and applicable illustrated parts diagram\u003c\/strong\u003e, rather than assuming a specific mounting location based solely on the bolt dimensions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCommon Reasons for Replacement\u003c\/h2\u003e\n\u003cp\u003eReplacement of the \u003cstrong\u003e539108366 Hex Cap Screw\u003c\/strong\u003e may be appropriate if the original fastener has:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBecome bent\u003c\/li\u003e\n\u003cli\u003eDeveloped damaged threads\u003c\/li\u003e\n\u003cli\u003eDeveloped a rounded head\u003c\/li\u003e\n\u003cli\u003eBecome heavily corroded\u003c\/li\u003e\n\u003cli\u003eSustained impact damage\u003c\/li\u003e\n\u003cli\u003eBecome stretched\u003c\/li\u003e\n\u003cli\u003eDeveloped excessive wear\u003c\/li\u003e\n\u003cli\u003eBeen cross-threaded\u003c\/li\u003e\n\u003cli\u003eBeen overtightened\u003c\/li\u003e\n\u003cli\u003eBecome seized\u003c\/li\u003e\n\u003cli\u003eBeen lost during equipment service\u003c\/li\u003e\n\u003cli\u003eBecome unsuitable for safe reuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA visibly damaged structural fastener should generally be replaced rather than reused.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eThread Inspection\u003c\/h2\u003e\n\u003cp\u003eBefore installing the replacement bolt, inspect the mating threads.\u003c\/p\u003e\n\u003cp\u003eCheck for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCross-threading\u003c\/li\u003e\n\u003cli\u003eCorrosion\u003c\/li\u003e\n\u003cli\u003eDirt\u003c\/li\u003e\n\u003cli\u003eDamaged threads\u003c\/li\u003e\n\u003cli\u003eMetal debris\u003c\/li\u003e\n\u003cli\u003eDistortion\u003c\/li\u003e\n\u003cli\u003ePrevious incorrect hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe new bolt should thread into the corresponding nut or threaded component correctly without requiring excessive force.\u003c\/p\u003e\n\u003cp\u003eIf significant resistance occurs immediately during installation, stop and verify the thread alignment and specification.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWasher Inspection\u003c\/h2\u003e\n\u003cp\u003eIf the application uses a washer, inspect it for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBending\u003c\/li\u003e\n\u003cli\u003eCracking\u003c\/li\u003e\n\u003cli\u003eExcessive corrosion\u003c\/li\u003e\n\u003cli\u003eDistortion\u003c\/li\u003e\n\u003cli\u003eEnlarged center hole\u003c\/li\u003e\n\u003cli\u003eExcessive wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWashers can help distribute clamping force across the mounting surface.\u003c\/p\u003e\n\u003cp\u003eReuse or replacement should follow the configuration specified for the equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eNut Inspection\u003c\/h2\u003e\n\u003cp\u003eIf \u003cstrong\u003e539108366\u003c\/strong\u003e is secured with a separate nut, verify that the nut has the correct:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1\/2-13 thread specification\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAlso inspect the nut for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDamaged threads\u003c\/li\u003e\n\u003cli\u003eCorrosion\u003c\/li\u003e\n\u003cli\u003eDistortion\u003c\/li\u003e\n\u003cli\u003eCross-threading\u003c\/li\u003e\n\u003cli\u003eDamaged locking features where applicable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not force mismatched threads together.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eMounting Surface Inspection\u003c\/h2\u003e\n\u003cp\u003eBefore installing the replacement fastener, inspect the components being secured.\u003c\/p\u003e\n\u003cp\u003eLook for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCracks\u003c\/li\u003e\n\u003cli\u003eElongated mounting holes\u003c\/li\u003e\n\u003cli\u003eBent brackets\u003c\/li\u003e\n\u003cli\u003eCorrosion\u003c\/li\u003e\n\u003cli\u003eDistorted metal\u003c\/li\u003e\n\u003cli\u003eDamaged bushings\u003c\/li\u003e\n\u003cli\u003eMissing spacers\u003c\/li\u003e\n\u003cli\u003eExcessive wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eInstalling a new bolt will not correct an underlying problem with damaged mounting components.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Considerations\u003c\/h2\u003e\n\u003cp\u003eBefore replacing \u003cstrong\u003e539108366\u003c\/strong\u003e:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003ePark the equipment on a stable, level surface.\u003c\/li\u003e\n\u003cli\u003eShut off the engine.\u003c\/li\u003e\n\u003cli\u003eRemove the ignition key where applicable.\u003c\/li\u003e\n\u003cli\u003eAllow all moving components to stop.\u003c\/li\u003e\n\u003cli\u003eDisconnect the spark plug or battery where appropriate.\u003c\/li\u003e\n\u003cli\u003eSecure the equipment against unintended movement.\u003c\/li\u003e\n\u003cli\u003eLocate the fastener using the applicable parts diagram.\u003c\/li\u003e\n\u003cli\u003eNote the original washer, spacer, and nut arrangement.\u003c\/li\u003e\n\u003cli\u003eRemove the original fastener.\u003c\/li\u003e\n\u003cli\u003eInspect the mounting holes and mating components.\u003c\/li\u003e\n\u003cli\u003eVerify that the replacement is \u003cstrong\u003e539108366\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003ePosition the components correctly.\u003c\/li\u003e\n\u003cli\u003eInsert the replacement bolt in the specified orientation.\u003c\/li\u003e\n\u003cli\u003eReinstall applicable washers, spacers, and nuts.\u003c\/li\u003e\n\u003cli\u003eTighten the fastener according to the equipment's service specifications.\u003c\/li\u003e\n\u003cli\u003eVerify that the secured components are correctly positioned.\u003c\/li\u003e\n\u003cli\u003eCheck for proper clearance from nearby moving components.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\n\u003cp\u003eDuring installation:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the correct \u003cstrong\u003e1\/2-13\u003c\/strong\u003e thread specification\u003c\/li\u003e\n\u003cli\u003eVerify the required 4-inch length\u003c\/li\u003e\n\u003cli\u003eUse the correct mating nut\u003c\/li\u003e\n\u003cli\u003eStart threads by hand where practical\u003c\/li\u003e\n\u003cli\u003eAvoid cross-threading\u003c\/li\u003e\n\u003cli\u003eUse properly fitting tools\u003c\/li\u003e\n\u003cli\u003eReinstall washers and spacers in their original locations\u003c\/li\u003e\n\u003cli\u003eFollow model-specific tightening specifications\u003c\/li\u003e\n\u003cli\u003eDo not substitute lower-grade hardware\u003c\/li\u003e\n\u003cli\u003eDo not shorten or modify the bolt to force compatibility\u003c\/li\u003e\n\u003cli\u003eVerify clearance after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify compatibility with your exact equipment model, product number, serial number, and assembly before ordering.\u003c\/li\u003e\n\u003cli\u003eMatch \u003cstrong\u003epart number 539108366\u003c\/strong\u003e directly with the applicable OEM parts documentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e539108366\u003c\/strong\u003e is specified as \u003cstrong\u003eHCS 1\/2-13 x 4 GR 5\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThe fastener has a nominal \u003cstrong\u003e1\/2-inch diameter\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThread specification is \u003cstrong\u003e1\/2-13\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThread count is \u003cstrong\u003e13 threads per inch\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eNominal length is \u003cstrong\u003e4 inches\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eStrength classification is \u003cstrong\u003eGrade 5\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThis is a \u003cstrong\u003ehex cap screw \/ hex-head fastener\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThe exact installation location is equipment-model dependent.\u003c\/li\u003e\n\u003cli\u003eDo not assume every 1\/2-13 x 4-inch bolt is an appropriate replacement.\u003c\/li\u003e\n\u003cli\u003eFastener grade, thread specification, length, construction, and application must match.\u003c\/li\u003e\n\u003cli\u003eDo not substitute a lower-strength fastener.\u003c\/li\u003e\n\u003cli\u003eDo not substitute a different thread pitch.\u003c\/li\u003e\n\u003cli\u003eUse \u003cstrong\u003e539108366\u003c\/strong\u003e as the primary fitment reference.\u003c\/li\u003e\n\u003cli\u003eInspect mating threads before installation.\u003c\/li\u003e\n\u003cli\u003eReplace damaged nuts, washers, or mounting hardware as necessary.\u003c\/li\u003e\n\u003cli\u003eDo not force the fastener into damaged or mismatched threads.\u003c\/li\u003e\n\u003cli\u003eDo not cut, weld, grind, drill, bend, or otherwise modify the replacement bolt.\u003c\/li\u003e\n\u003cli\u003eFollow the applicable equipment torque specifications when available.\u003c\/li\u003e\n\u003cli\u003eVerify that the fastener does not interfere with moving components after installation.\u003c\/li\u003e\n\u003cli\u003eShut off the engine and prevent accidental starting before servicing equipment hardware.\u003c\/li\u003e\n\u003cli\u003eSecurely support the equipment if access requires raising it.\u003c\/li\u003e\n\u003cli\u003eThis listing is for \u003cstrong\u003eone Husqvarna 539108366 1\/2-13 x 4-Inch Grade 5 Hex Cap Screw only\u003c\/strong\u003e unless otherwise specified. Nuts, washers, spacers, brackets, and other mounting components are sold separately unless explicitly included.\u003c\/li\u003e\n\u003cli\u003eMatch \u003cstrong\u003eHusqvarna 539108366\u003c\/strong\u003e with your equipment's OEM parts documentation before ordering to ensure proper fitment.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Husqvarna","offers":[{"title":"Default Title","offer_id":53754130760043,"sku":"539108366","price":8.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/539108366.jpg?v=1787343596","url":"https:\/\/generalsprayers.com\/products\/husqvarna-539108366-1-2-13-x-4-grade-5-hex-cap-screw-genuine-oem-replacement-bolt","provider":"GeneralSprayers","version":"1.0","type":"link"}