{"product_id":"ez-loader-crownlock-nut-zinc-plated-290-002596","title":"Crownlock Nut 5\/8\"-11 Zinc Plated Grade 5 290-002596","description":"\u003ch2\u003eCrownlock Nut 5\/8\"-11 Zinc Plated Grade 5 290-002596\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e5\/8\" All-Metal Locknut\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eCrownlock Nut 5\/8\"-11 Zinc Plated Grade 5 290-002596\u003c\/strong\u003e is a replacement all-metal locking nut used on compatible EZ Loader boat trailer hardware. This crownlock nut is designed for \u003cstrong\u003e5\/8\"-11 coarse-thread bolts\u003c\/strong\u003e where a strong vibration-resistant fastener is required.\u003c\/p\u003e\n\u003cp\u003eA crownlock nut is an all-metal prevailing-torque locknut. Instead of using a nylon insert, the top of the nut is slightly distorted or crimped so it grips the bolt threads as it tightens. This helps resist loosening from road vibration, shock loading, trailer flex, and repeated launch-and-retrieval use.\u003c\/p\u003e\n\u003cp\u003eThis nut is commonly used in trailer hardware locations such as pivot bolts, roller assemblies, brackets, suspension hardware, and other high-stress fastening points depending on the trailer model and setup. Correct thread size matters because 5\/8\"-11 coarse thread hardware is not interchangeable with fine-thread 5\/8\" hardware.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\" style=\"text-align: left; padding: 12px 14px; background: #12344d; color: #ffffff; font-size: 18px; border: 1px solid #d9e2e8;\"\u003eProduct Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 32%; padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003ePart Number:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003e290-002596\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003ePart Type:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eCrownlock nut \/ all-metal locknut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eThread Size:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003e5\/8\"-11 TPI coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eGrade:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eGrade 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eLocking Style:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eAll-metal prevailing-torque crownlock design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eMaterial \/ Finish:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eZinc-plated steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eColor:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eZinc \/ silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eFits:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eCompatible EZ Loader trailer applications using 5\/8\"-11 coarse-thread bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eCommon Use:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eOften used with compatible 5\/8\" pivot bolts, roller assembly hardware, brackets, and heavy trailer hardware locations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eApplication Type:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eBoat trailer hardware, roller hardware, bracket hardware, pivot hardware, and suspension-related fastening applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eFunction:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eHelps secure compatible 5\/8\"-11 trailer bolts while resisting loosening from vibration, shock, and trailer movement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eWhy Buyers Like This Part:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eAll-metal locking design, 5\/8\"-11 coarse thread, Grade 5 strength, zinc-plated finish, useful for replacing corroded or worn trailer locknuts.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; font-weight: bold; border: 1px solid #d9e2e8; background: #eaf3f8;\"\u003eImportant Fitment Note:\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003eConfirm your bolt thread is 5\/8\"-11 coarse thread before ordering. This nut does not fit 5\/8\"-18 fine-thread hardware, 1\/2\" bolts, lug bolts, wheel studs, or spindle nuts.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5\/8\"-11 Crownlock Nut Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement 5\/8\"-11 coarse-thread crownlock nut for compatible EZ Loader trailer hardware\u003c\/li\u003e\n\u003cli\u003eAll-metal locking design helps resist loosening from vibration and shock\u003c\/li\u003e\n\u003cli\u003eGrade 5 zinc-plated steel construction\u003c\/li\u003e\n\u003cli\u003eCommonly used with compatible 5\/8\" trailer bolts and pivot hardware\u003c\/li\u003e\n\u003cli\u003eUseful for replacing rusted, rounded, worn, or missing trailer nuts\u003c\/li\u003e\n\u003cli\u003eDesigned for boat trailer hardware service and repair applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat Is a Crownlock Nut?\u003c\/h3\u003e\n\u003cp\u003eA crownlock nut is an \u003cstrong\u003eall-metal locknut\u003c\/strong\u003e. The top of the nut is slightly crimped or distorted so it grips the bolt threads as it tightens. That extra thread pressure helps the nut resist backing off under vibration, shock, and repeated trailer movement.\u003c\/p\u003e\n\u003cp\u003eUnlike a nyloc nut, a crownlock nut does not use a nylon insert. That makes it useful in heavier trailer hardware locations where an all-metal locking fastener is preferred.\u003c\/p\u003e\n\u003ch3\u003eTypical EZ Loader Trailer Applications\u003c\/h3\u003e\n\u003cp\u003eThis crownlock nut may be used on compatible EZ Loader trailer hardware where a \u003cstrong\u003e5\/8\"-11 coarse-thread\u003c\/strong\u003e all-metal locknut is required. Common use areas may include pivot bolts, roller assemblies, bracket hardware, suspension hardware, and heavy trailer hardware locations depending on the trailer model.\u003c\/p\u003e\n\u003cp\u003eBecause EZ Loader trailers use different fasteners by application, always compare the old nut, bolt, thread pitch, and hardware location before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhy EZ Loader Uses Crownlock-Style Nuts\u003c\/h3\u003e\n\u003cp\u003eEZ Loader uses crownlock-style nuts in trailer hardware locations where vibration, road shock, and repeated loading can loosen standard nuts. The crimped all-metal locking section grips the bolt threads and helps maintain clamping pressure without relying on a separate lock washer.\u003c\/p\u003e\n\u003cp\u003eThis matters on boat trailers because lock washers can flatten, crack, or break under stress. When that happens, a gap can form and hardware may loosen over time. A crownlock nut helps reduce that risk by keeping steady thread pressure on the bolt.\u003c\/p\u003e\n\u003cp\u003eFor best results, replace worn or repeatedly removed crownlock nuts during service, especially on pivot bolts, suspension, roller, bracket, and frame hardware.\u003c\/p\u003e\n\u003ch3\u003eImportant Difference: 5\/8\"-11 vs. 5\/8\"-18\u003c\/h3\u003e\n\u003cp\u003eThis part is a \u003cstrong\u003e5\/8\"-11 coarse-thread crownlock nut\u003c\/strong\u003e. It is not the same as a 5\/8\"-18 fine-thread nut.\u003c\/p\u003e\n\u003cp\u003eTrailer hardware may use either coarse-thread or fine-thread fasteners depending on the application. If the thread pitch does not match, the nut can cross-thread, strip, or fail to tighten correctly.\u003c\/p\u003e\n\u003ch3\u003eAssociated \/ Compatible Parts\u003c\/h3\u003e\n\u003cp\u003eThis crownlock nut is commonly used with compatible 5\/8\" trailer hardware. Confirm your specific bolt and application before ordering.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"padding: 12px 14px; background: #12344d; color: #ffffff; border: 1px solid #d9e2e8;\"\u003ePart Description\u003c\/th\u003e\n\u003cth style=\"padding: 12px 14px; background: #12344d; color: #ffffff; border: 1px solid #d9e2e8;\"\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003e\u003ca href=\"\/products\/ez-loader-replacement-bolt-290-027394\"\u003eReplacement Bolt for Quad Roller Assembly\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 14px; border: 1px solid #d9e2e8;\"\u003e290-027394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eInstallation Considerations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the mating bolt is 5\/8\"-11 coarse thread.\u003c\/li\u003e\n\u003cli\u003eDo not force the nut onto fine-thread hardware.\u003c\/li\u003e\n\u003cli\u003eInspect the bolt, bracket, roller assembly, pivot point, and mounting surface before reassembly.\u003c\/li\u003e\n\u003cli\u003eReplace badly rusted, stretched, rounded, or damaged hardware before towing.\u003c\/li\u003e\n\u003cli\u003eReplace crownlock nuts that have been repeatedly removed and reinstalled, especially in high-vibration trailer locations.\u003c\/li\u003e\n\u003cli\u003eUse the proper wrench or socket to avoid rounding the nut.\u003c\/li\u003e\n\u003cli\u003eTighten hardware to the proper specification for the trailer application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCrownlock Nut Fitment Guidance\u003c\/h3\u003e\n\u003cp\u003eThis is not a universal nut for every trailer hardware location.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the thread size is 5\/8\"-11.\u003c\/li\u003e\n\u003cli\u003eConfirm the hardware application uses a crownlock or all-metal locknut.\u003c\/li\u003e\n\u003cli\u003eConfirm the grade and finish are suitable for the repair location.\u003c\/li\u003e\n\u003cli\u003eCompare the old nut and bolt before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReal-World Insight\u003c\/h3\u003e\n\u003cp\u003eSmall trailer hardware often causes bigger problems when it is reused past its service life. A corroded or rounded crownlock nut may not clamp properly, and a mismatched thread pitch can damage the bolt. When servicing roller assemblies, pivot points, brackets, suspension, or frame hardware, replacing questionable locknuts is often cheaper than fighting loose, seized, or damaged hardware later.\u003c\/p\u003e\n\u003ch3\u003eQuestions or Need Help Matching Parts?\u003c\/h3\u003e\n\u003cp\u003eWe’re based in \u003cstrong\u003eHardeeville, South Carolina\u003c\/strong\u003e, serving customers nationwide.\u003c\/p\u003e\n\u003cp\u003e📞 Call us — we answer the phone and help you get it right.\u003cbr\u003e📧 Send photos if needed — often the fastest way to confirm fitment.\u003c\/p\u003e\n\u003cp\u003eWe focus on \u003cstrong\u003ematching parts correctly the first time\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"border: 1px solid #d9e2e8; background: #f6f9fb; padding: 16px 18px; margin: 24px 0; border-radius: 6px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eIndependent EZ Loader Parts Dealer Notice\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEZLoaderParts411.com\u003c\/strong\u003e and \u003cstrong\u003eEZLoaderTrailers411.com\u003c\/strong\u003e are distributor and dealer-resource websites for EZ Loader boat trailers and EZ Loader OEM replacement parts. These websites are operated by the \u003cstrong\u003e411Marine team\u003c\/strong\u003e, an independent brick-and-mortar trailer dealer specializing in EZ Loader trailers, OEM replacement parts, and fitment support.\u003c\/p\u003e\n\u003cp\u003eOur reputation and long history with EZ Loader products may be what brought you here. We appreciate that trust, but we want the relationship to be clear: we are a dealer resource, not the manufacturer.\u003c\/p\u003e\n\u003cp\u003eWe support our previous trailer customers and welcome new customers who need help identifying the correct EZ Loader parts. At our Hardeeville, South Carolina store, we keep new model trailers on site and use real trailers, real measurements, photos, and hands-on comparison whenever possible to help verify parts before customers order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eWhat to Have Ready When You Call\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTrailer year, make, and model\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eVIN, if available\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOld bolt thread size\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHardware location on the trailer\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePhotos of the existing nut, bolt, bracket, roller assembly, or pivot point\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EZ Loader","offers":[{"title":"Default Title","offer_id":52897100792173,"sku":"290-002596","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0966\/3761\/6493\/files\/EZLoader290-002596ZincCrownLock5-8in-11TPISideView.jpg?v=1779303195","url":"https:\/\/ezloaderparts411.com\/products\/ez-loader-crownlock-nut-zinc-plated-290-002596","provider":"EZLoaderParts411.com","version":"1.0","type":"link"}