{"product_id":"round-zinc-plated-u-bolt-3-x-9-16-diameter-x-7-long-fine-thread-grade-5-ub-r303-zp","title":"Round Zinc Plated U-Bolt 3\" x 9\/16\" Diameter x 7\" Long Fine Thread Grade 5 (UB-R303-ZP)","description":"\u003cstyle\u003e\n  .rp-mag-lock{\n    --rp-black:#111111;\n    --rp-charcoal:#1d1d1f;\n    --rp-gray:#6b7280;\n    --rp-light:#f5f5f5;\n    --rp-line:#d8d8d8;\n    --rp-maroon:#6e0f11;\n    --rp-gold:#d7a126;\n    --rp-cream:#fff7e3;\n    --rp-shadow:0 16px 36px rgba(0,0,0,.08);\n    --rp-radius:20px;\n    font-family:\"Helvetica Neue\",Helvetica,Arial,sans-serif;\n    color:var(--rp-black);\n    line-height:1.6;\n  }\n\n  .rp-mag-lock *{box-sizing:border-box;}\n\n  .rp-mag-lock .rp-shell{\n    max-width:1080px;\n    margin:0 auto;\n    padding:28px 18px 40px 18px;\n    background:linear-gradient(180deg,#fafafa 0%,#ffffff 22%,#ffffff 100%);\n  }\n\n  .rp-mag-lock .rp-hero{\n    position:relative;\n    overflow:hidden;\n    border:1px solid #ececec;\n    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.rp-feature-grid{grid-template-columns:1fr;}\n    .rp-mag-lock .rp-title{font-size:28px;}\n    .rp-mag-lock .rp-subhead{font-size:16px;}\n  }\n\n  @media (max-width:640px){\n    .rp-mag-lock .rp-shell{padding:18px 12px 28px 12px;}\n    .rp-mag-lock .rp-hero{border-radius:22px;padding:24px 18px 22px 18px;}\n    .rp-mag-lock .rp-card,\n    .rp-mag-lock .rp-feature{padding:16px;}\n    .rp-mag-lock .rp-title{font-size:24px;}\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"rp-mag-lock\"\u003e\n  \u003cdiv class=\"rp-shell\"\u003e\n\n    \u003cdiv class=\"rp-hero\"\u003e\n      \u003cdiv class=\"rp-logo\"\u003e\n        \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/LOGO-FINALx200.png?v=1763669885\" alt=\"R \u0026amp; P Carriages\"\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-kicker\"\u003eTrailer Axle U-Bolt \/ Suspension Hardware\u003c\/div\u003e\n\n      \u003ch1 class=\"rp-title\"\u003eRound Zinc Plated U-Bolt 3\" x 9\/16\" Diameter x 7\" Long Fine Thread Grade 5\u003c\/h1\u003e\n\n      \u003cp class=\"rp-subhead\"\u003eSilver zinc plated metal round U-bolt for compatible trailer axle and suspension applications where a 3\" inside width, 9\/16\" diameter, 7\" long U-bolt is required.\u003c\/p\u003e\n\n      \u003cdiv class=\"rp-partline\"\u003e\n        \u003cspan class=\"rp-badge\"\u003eSKU: UB-R303-ZP\u003c\/span\u003e\n        \u003cspan class=\"rp-badge alt\"\u003e3\" x 9\/16\" Dia. x 7\" Long\u003c\/span\u003e\n        \u003cspan class=\"rp-badge alt\"\u003eFine Thread \/ SAE Grade 5\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section rp-grid-3\"\u003e\n\n      \u003cdiv class=\"rp-sticky-card\"\u003e\n        \u003cdiv class=\"rp-rule-title\"\u003e\n          \u003ch2\u003eKey Measurements \u0026amp; Specs\u003c\/h2\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-table-wrap\"\u003e\n          \u003ctable\u003e\n            \u003ctbody\u003e\n              \u003ctr\u003e\n                \u003cth\u003eSpecification\u003c\/th\u003e\n                \u003cth\u003eDetail\u003c\/th\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eUB-R303-ZP\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eRound trailer axle U-bolt\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003e3\" x 9\/16\" diameter x 7\" long\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eThread Type\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eFine thread\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eThreads Per Inch\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003e18 TPI\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eSAE Grade 5\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eMaterial \/ Finish\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eMetal, zinc plated\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eSilver\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eQuantity Included\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003e1 U-bolt\u003c\/td\u003e\n              \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n          \u003c\/table\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-sticky-card\"\u003e\n        \u003cdiv class=\"rp-rule-title\"\u003e\n          \u003ch2\u003eFitment \/ Application\u003c\/h2\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-table-wrap\"\u003e\n          \u003ctable\u003e\n            \u003ctbody\u003e\n              \u003ctr\u003e\n                \u003cth\u003eCategory\u003c\/th\u003e\n                \u003cth\u003eDetails\u003c\/th\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eSystem\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eTrailer axle and suspension hardware\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eApplication Reference\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eFits compatible 7000# applications where measurements and hardware match\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eMatching Thread\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003e9\/16\"-18 fine thread\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eRelated Hardware Reference\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eUBN-9C \/ TP-4 reference where correct for the application\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eFitment Method\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eVerify axle tube size, U-bolt width, bolt diameter, length, plate fitment, and nut thread before ordering\u003c\/td\u003e\n              \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n          \u003c\/table\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-sticky-card\"\u003e\n        \u003cdiv class=\"rp-rule-title\"\u003e\n          \u003ch2\u003eTop Features\u003c\/h2\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-table-wrap\"\u003e\n          \u003ctable\u003e\n            \u003ctbody\u003e\n              \u003ctr\u003e\n                \u003cth\u003eFeature\u003c\/th\u003e\n                \u003cth\u003eBuyer Benefit\u003c\/th\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eZinc Plated Finish\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eSilver finish provides corrosion-resistant surface protection for trailer hardware use\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003e9\/16\"-18 Fine Thread\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eMatches compatible fine-thread nuts and suspension hardware\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003eSAE Grade 5\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eBuilt for heavier-duty trailer suspension fastening applications where Grade 5 hardware is specified\u003c\/td\u003e\n              \u003c\/tr\u003e\n              \u003ctr\u003e\n                \u003ctd\u003e\u003cstrong\u003e3\" x 7\" Size\u003c\/strong\u003e\u003c\/td\u003e\n                \u003ctd\u003eUseful for compatible axle tube and U-bolt plate setups requiring this measurement\u003c\/td\u003e\n              \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n          \u003c\/table\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section rp-grid-2\"\u003e\n      \u003cdiv class=\"rp-card\"\u003e\n        \u003cdiv class=\"rp-rule-title\"\u003e\n          \u003ch2\u003eOverview\u003c\/h2\u003e\n        \u003c\/div\u003e\n        \u003cp class=\"rp-lead\"\u003eThis listing is for one round zinc plated U-bolt, SKU UB-R303-ZP. The U-bolt measures 3\" x 9\/16\" diameter x 7\" long and uses 9\/16\"-18 fine thread. It is SAE Grade 5 hardware with a silver zinc plated finish for compatible trailer axle and suspension applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-card rp-service\"\u003e\n        \u003ch2\u003eR\u0026amp;P Service Insight\u003c\/h2\u003e\n        \u003cp\u003eU-bolts must be matched by measurement and thread, not by appearance alone. Before replacing axle hardware, confirm the complete suspension stack matches this 3\" width, 9\/16\" diameter, 7\" length, and 18 TPI thread requirement.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eMeasure First:\u003c\/strong\u003e Confirm U-bolt width, diameter, and overall length before ordering.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eThread Match:\u003c\/strong\u003e This U-bolt uses 9\/16\"-18 fine thread.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eHardware Match:\u003c\/strong\u003e Confirm the nut and plate match the U-bolt size and thread before installation.\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section\"\u003e\n      \u003cdiv class=\"rp-card rp-knowledge\"\u003e\n        \u003ch2\u003eR\u0026amp;P Knowledge Hub\u003c\/h2\u003e\n        \u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Use for compatible 7000# trailer axle applications where the existing U-bolt dimensions, thread, and related hardware match.\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003eVehicle \/ System Fit:\u003c\/strong\u003e Trailer axle and suspension hardware applications using a round 3\" x 9\/16\" diameter x 7\" long U-bolt.\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003eInstallation Notes:\u003c\/strong\u003e Verify axle tube size, U-bolt plate, nut thread, and length before installation. Replace worn or mismatched suspension hardware as needed.\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003ePerformance Insight:\u003c\/strong\u003e Correct U-bolt size and thread engagement are critical for proper axle clamping and suspension hardware alignment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section\"\u003e\n      \u003cdiv class=\"rp-card rp-knowledge\"\u003e\n        \u003ch2\u003eBrand \u0026amp; Fitment Note\u003c\/h2\u003e\n        \u003cp\u003e\u003cstrong\u003eSelling Brand:\u003c\/strong\u003e R\u0026amp;P Carriages\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003eApplication Reference:\u003c\/strong\u003e 7000# application references are fitment guides only. Final fit depends on matching the U-bolt measurements and related suspension hardware.\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003eWhat This Means:\u003c\/strong\u003e This listing is for one R\u0026amp;P Carriages round zinc plated U-bolt, not a complete U-bolt kit unless specifically stated.\u003c\/p\u003e\n        \u003cp\u003e\u003cstrong\u003eBefore Ordering:\u003c\/strong\u003e Verify measurements, thread pitch, axle tube size, plate compatibility, nut compatibility, and included components before installation.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section\"\u003e\n      \u003cdiv class=\"rp-card rp-service\"\u003e\n        \u003ch2\u003eR\u0026amp;P Repair Insight\u003c\/h2\u003e\n        \u003cp\u003eWhen servicing trailer suspension hardware, U-bolts should be selected by exact measurement and thread specification. A mismatch in diameter, length, thread pitch, or plate fit can prevent proper installation.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eWidth Check:\u003c\/strong\u003e Confirm the 3\" U-bolt width matches the axle tube and plate setup.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eThread Check:\u003c\/strong\u003e Confirm the mating nuts are 9\/16\"-18 fine thread.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eLength Check:\u003c\/strong\u003e Confirm the 7\" length provides the correct fit for the spring stack and plate arrangement.\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section\"\u003e\n      \u003cdiv class=\"rp-rule-title\"\u003e\n        \u003ch2\u003eFeatures\u003c\/h2\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-feature-grid\"\u003e\n        \u003cdiv class=\"rp-feature\"\u003e\n          \u003ch3\u003eRound U-Bolt Design\u003c\/h3\u003e\n          \u003cp\u003eDesigned for compatible round trailer axle and suspension fastening applications where this size is required.\u003c\/p\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-feature\"\u003e\n          \u003ch3\u003e9\/16\"-18 Fine Thread\u003c\/h3\u003e\n          \u003cp\u003eFine-thread 9\/16\" diameter hardware with 18 threads per inch for matching compatible nuts.\u003c\/p\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-feature\"\u003e\n          \u003ch3\u003eSAE Grade 5 Hardware\u003c\/h3\u003e\n          \u003cp\u003eGrade 5 specification for compatible trailer suspension applications requiring this hardware grade.\u003c\/p\u003e\n        \u003c\/div\u003e\n\n        \u003cdiv class=\"rp-feature\"\u003e\n          \u003ch3\u003eSilver Zinc Plated Finish\u003c\/h3\u003e\n          \u003cp\u003eZinc plated metal construction with a silver finish for clean appearance and surface protection.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-section\"\u003e\n      \u003cdiv class=\"rp-rule-title\"\u003e\n        \u003ch2\u003eIncluded Components\u003c\/h2\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"rp-table-wrap\"\u003e\n        \u003ctable\u003e\n          \u003ctbody\u003e\n            \u003ctr\u003e\n              \u003cth\u003eQuantity\u003c\/th\u003e\n              \u003cth\u003eItem\u003c\/th\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003e1\u003c\/td\u003e\n              \u003ctd\u003eRound zinc plated U-bolt, 3\" x 9\/16\" diameter x 7\" long, 9\/16\"-18 fine thread\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eNot Included\u003c\/td\u003e\n              \u003ctd\u003eNuts, plates, washers, and additional suspension hardware unless separately selected or stated\u003c\/td\u003e\n            \u003c\/tr\u003e\n          \u003c\/tbody\u003e\n        \u003c\/table\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-note\"\u003e\n      \u003cstrong\u003eImportant Fitment Note:\u003c\/strong\u003e Verify all measurements, thread pitch, axle tube size, U-bolt plate fitment, nut compatibility, and included components before installation. This listing is for one U-bolt only unless otherwise stated.\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-cta-wrap\"\u003e\n      \u003ca class=\"rp-btn\" href=\"\/search?q=9%2F16-18+u-bolt\"\u003eShop Related U-Bolt Hardware\u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"rp-seo\"\u003eUB-R303-ZP round zinc plated U bolt, 3 inch 9\/16 diameter 7 inch long U bolt, 9\/16-18 fine thread U bolt, SAE Grade 5 trailer axle U bolt, silver zinc plated metal U bolt, 7000 lb trailer axle U bolt, UBN-9C compatible thread reference, TP-4 trailer suspension hardware reference, R\u0026amp;P Carriages trailer axle suspension hardware\u003c\/div\u003e\n\n    \u003cdiv class=\"rp-footer\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/Baseball_AdvertisingRP-sign_1.jpg?v=1771533480\" alt=\"R \u0026amp; P Carriages\"\u003e\n    \u003c\/div\u003e\n\n    \u003chr style=\"border:0; border-top:1px solid #eee; margin:24px 0 0 0;\"\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Need a Trailer Part","offers":[{"title":"Default Title","offer_id":59583747522846,"sku":"UB-R303-ZP","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/UB-R303-ZP.4.jpg?v=1783539869","url":"https:\/\/needatrailerpart.com\/products\/round-zinc-plated-u-bolt-3-x-9-16-diameter-x-7-long-fine-thread-grade-5-ub-r303-zp","provider":"Need a Trailer Part","version":"1.0","type":"link"}