{"product_id":"boat-trailer-cotter-key-290-002656-ss","title":"Boat Trailer Spindle Cotter Key – 5\/32\" SS | 290-002656","description":"\u003ch2\u003eStainless Steel Boat Trailer Spindle Cotter Key – 5\/32\" | 290-002656\u003c\/h2\u003e\n\u003cp\u003eThe EZ Loader stainless steel boat trailer cotter key, part number 290-002656, is a replacement axle spindle locking fastener measuring \u003cstrong\u003e5\/32\" in diameter and 1-1\/4\" in length\u003c\/strong\u003e. Also called a cotter pin or split pin, this small but important component is used in compatible boat trailer wheel hub assemblies to help secure the spindle retaining nut after proper wheel bearing adjustment.\u003c\/p\u003e\n\u003cp\u003eIts stainless steel construction provides corrosion resistance in marine environments where boat trailer components are exposed to water, road spray, and repeated launching and retrieval. Confirm the spindle hole diameter, retaining nut configuration, and required cotter key length before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhat Is the Purpose of a Boat Trailer Cotter Key?\u003c\/h3\u003e\n\u003cp\u003eA boat trailer spindle cotter key acts as a \u003cstrong\u003emechanical locking device that prevents the spindle retaining nut from backing off\u003c\/strong\u003e during normal towing conditions.\u003c\/p\u003e\n\u003cp\u003eOn many conventional wheel hub assemblies, the bearings are installed and adjusted using a spindle nut. After the nut has been correctly positioned according to the axle manufacturer's instructions, the cotter key passes through a cross-drilled hole in the spindle and the corresponding slot in a castellated nut or compatible nut-retaining device.\u003c\/p\u003e\n\u003cp\u003eThe two ends of the cotter key are then bent to hold the pin in position. This creates a positive mechanical stop that helps prevent the retaining nut from rotating loose due to road vibration.\u003c\/p\u003e\n\u003ch3\u003eWhy Is a Cotter Key Important?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle nut security:\u003c\/strong\u003e Helps prevent the retaining nut from loosening after the wheel bearings have been properly adjusted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel hub retention:\u003c\/strong\u003e Helps maintain the retaining nut's position and reduces the risk of excessive hub movement or wheel assembly separation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel bearing maintenance:\u003c\/strong\u003e Commonly replaced when inspecting, servicing, repacking, or replacing wheel bearings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical locking protection:\u003c\/strong\u003e Provides a physical retaining method rather than depending solely on nut friction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine corrosion resistance:\u003c\/strong\u003e Stainless steel construction helps resist corrosion associated with wet boat trailer environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The cotter key does not carry the trailer's weight, establish wheel bearing adjustment, or replace proper spindle nut installation. Its purpose is to help retain the spindle nut after the axle manufacturer's specified bearing adjustment procedure has been completed.\u003c\/p\u003e\n\u003ch3\u003eFeatures and Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEZ Loader replacement cotter key, part number 290-002656.\u003c\/li\u003e\n\u003cli\u003eStainless steel construction for corrosion resistance.\u003c\/li\u003e\n\u003cli\u003e5\/32\" nominal diameter.\u003c\/li\u003e\n\u003cli\u003e1-1\/4\" (1.25\") nominal length.\u003c\/li\u003e\n\u003cli\u003eSplit-pin design for compatible spindle nut locking arrangements.\u003c\/li\u003e\n\u003cli\u003eCommonly used with boat trailer axle spindles, wheel hubs, bearings, and retaining nuts.\u003c\/li\u003e\n\u003cli\u003eUseful replacement hardware during routine hub and bearing maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #cbd5dc; margin: 12px 0 20px 0; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\" style=\"background-color: #12344d; color: #ffffff; text-align: left; padding: 12px; border: 1px solid #cbd5dc; font-weight: bold;\"\u003eProduct Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; width: 38%; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eEZ Loader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003ePart Number \/ MPN\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003e290-002656\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003ePart Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eAxle Spindle Cotter Key \/ Cotter Pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eDiameter\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003e5\/32 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eLength\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003e1-1\/4 inches (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eStainless Steel (SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eCompatible boat trailer axle spindle retaining nut assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eHelps prevent spindle retaining nut rotation and loosening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eCommonly Used With\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eWheel hubs, bearings, spindle nuts, and compatible nut retainers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f8fbfc; border: 1px solid #cbd5dc; padding: 9px; font-weight: bold;\"\u003eImportant Fitment Note\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #cbd5dc; padding: 9px;\"\u003eVerify spindle hole diameter, retaining nut design, and cotter key dimensions before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhen Should a Boat Trailer Cotter Key Be Replaced?\u003c\/h3\u003e\n\u003cp\u003eA cotter key should generally be replaced whenever it is removed during wheel hub or bearing service. Repeated bending and straightening can weaken the metal, making reuse undesirable.\u003c\/p\u003e\n\u003cp\u003eReplace the cotter key if it is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMissing from the axle spindle retaining assembly.\u003c\/li\u003e\n\u003cli\u003eExcessively bent, cracked, or physically damaged.\u003c\/li\u003e\n\u003cli\u003eCorroded or showing signs of deterioration.\u003c\/li\u003e\n\u003cli\u003eRemoved during bearing inspection, repacking, or replacement.\u003c\/li\u003e\n\u003cli\u003eIncorrectly sized for the spindle hole or retaining nut.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation and Fitment Considerations\u003c\/h3\u003e\n\u003cp\u003eBefore installing a replacement cotter key, inspect the spindle, retaining nut, washer, wheel bearings, and related hardware for wear or damage.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the specified cotter key diameter is 5\/32\".\u003c\/li\u003e\n\u003cli\u003eVerify the required length is 1-1\/4\".\u003c\/li\u003e\n\u003cli\u003eFollow the axle manufacturer's wheel bearing adjustment procedure.\u003c\/li\u003e\n\u003cli\u003eInstall the cotter key through the spindle and compatible retaining nut or locking device.\u003c\/li\u003e\n\u003cli\u003eSecure the pin ends according to the axle manufacturer's instructions.\u003c\/li\u003e\n\u003cli\u003eDo not substitute an undersized cotter key or assume all trailer spindles use identical retaining hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSafety Notice:\u003c\/strong\u003e Never tow a trailer with missing or improperly installed spindle nut locking hardware. A cotter key is not a substitute for correct wheel bearing adjustment, proper hub installation, or inspection of damaged spindle components.\u003c\/p\u003e\n\u003ch3\u003eIndependent EZ Loader Parts Dealer Notice\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEZLoaderParts411\u003c\/strong\u003e is an EZ Loader OEM replacement parts supplier owned and operated by \u003cstrong\u003e411MarineRec, LLC. and the 411Marine family\u003c\/strong\u003e, serving customers since 1998 from Hardeeville, South Carolina.\u003c\/p\u003e\n\u003cp\u003e411MarineCom is a high-volume independent EZ Loader trailer dealer and direct-to-factory source for new EZ Loader marine \u003ca href=\"https:\/\/ezloadertrailers411.com\/\" title=\"New EZ Loader Boat Trailer Fitment\"\u003eboat trailers\u003c\/a\u003e, OEM replacement parts, and fitment support.\u003c\/p\u003e\n\u003cp\u003eWe are a dealer resource, not the manufacturer. Our team helps previous trailer customers and new customers identify the correct EZ Loader parts using trailer VIN details, photos, measurements, real trailer comparisons, hands-on parts experience, publicly available resources, our websites, and direct customer conversations whenever possible.\u003c\/p\u003e","brand":"EZ Loader","offers":[{"title":"Default Title","offer_id":52897105838445,"sku":"290-002656","price":1.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0966\/3761\/6493\/files\/290-002656-ss-cotter-pin-1-25-inch.jpg?v=1791922705","url":"https:\/\/ezloaderparts411.com\/products\/boat-trailer-cotter-key-290-002656-ss","provider":"EZLoaderParts411.com","version":"1.0","type":"link"}