{"title":"U-Bolt Kits","description":"","products":[{"product_id":"3-inch-trailer-axle-u-bolt-kit-9-16-x-7","title":"RGP 5,200 - 7,000 lb Axles, Fits 3\" Round Axle, 9\/16\"-18 Thread  Grade 5 U-Bolt Kit - 7\" U-Bolts","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSecure, reliable, and built to last, this U-bolt provides a complete mounting solution for fastening your trailer's leaf springs to 3\" round axles. Designed for 5,200 - 7,000 lb trailer axles, this kit include 7 inch grade 5 U-bolts, reinforced mounting plates, and nuts for a professional, OEM level fit that ensures proper axle alignment under heavy loads.\u003c\/p\u003e\n\u003cp\u003eConstructed from heavy duty steel with corrosion resistant zinc plating, these U-bolts resist rust, moisture, and road salt, providing long-term durability and vibration-resistant performance. Each kit convers a single axle and includes everything needed for a secure installation, making it ideal for utility trailers, equipment haulers, and cargo trailers. To maintain maximum clamping force and safe towing, replacement is recommended whenever installing new axles or leaf springs. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's include by Kit option:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e4 x U-Bolts - 7\" long, fits 3\" round axles, 9\/16\" thread\u003cbr\u003e2 x Mounting Plates - Reinforced design for even clamping\u003cbr\u003e8 x Grade 5 Hex Nuts\u003cbr\u003e8 x Lock Washers\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAxle diameter: 3\"\u003cbr\u003eTypical axle capacity: 5,200 lb - 7,000 lb\u003cbr\u003eSpring width: 1-3\/4\"\u003cbr\u003eThread dimensions: 9\/16”-18\u003c\/p\u003e","brand":"RunningGearParts.com","offers":[{"title":"Default Title","offer_id":41948045181031,"sku":"SP-UK-PUBR9-GR5-M","price":25.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/files\/3-trailer-axle-u-bolt-kit-9-16-x-7-5-2k-7k-leaf-spring-hardware-image-1.png?v=1792522637"},{"product_id":"3-5k-trailer-axle-u-bolt-kit-2-3-8-round","title":"RGP 3,500 lb Trailer Axle U-Bolt Kit - Fits 2-3\/8\" Round Axles - 5.5\" x 1\/2\" U-Bolts with Tie Plates \u0026 Hardware","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eUpgrade or replace your trailer's suspension hardware with this 3,500 lbs trailer axle U-bolt kit, designed to provide a secure, long-lasting connection between your axle and leaf springs. Compatible with standard 2-3\/8\" round trailer axles and 1-3\/4\" wide double eye or slipper leaf springs, this kit is ideal for utility trailers, boat trailers, cargo trailers, and more. \u003c\/p\u003e\n\u003cp\u003eEach kit includes all necessary hardware for a complete axle mounting solution, 4 heavy duty 5.5\" U-bolts with 1\/2\"-20 threads, eight hex nuts with lock washers, and two tie plates. All components are zinc-coated to resist rust and corrosion, ensuring reliable performance in all weather and road conditions. \u003c\/p\u003e\n\u003cp\u003eDesigned for OEM-style fitments, this U-bolt kit ensures proper axle alignment and stable towing. Whether you're repairing an older suspension or assembling a new trailer, it delivers the strength and durability needed for safe, dependable towing. \u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eWhat's include by Kit Option:\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp\u003e(4) U-bolts - 5.5\" length x 1\/2\"-20 thread - fits 2-3\/8\" round axles\u003cbr\u003e(2) Tie plates - fits 1-3\/4\" wide springs\u003cbr\u003e(8) Hex nuts with lock washers\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAxle diameter: 2-3\/8\"\u003cbr\u003eAxle capacity: Typical 3,500 lb axle\u003cbr\u003eSpring width: 1-3\/4\"\u003c\/p\u003e\n\u003cp\u003eU-Bolt Length: 5.5\"\u003c\/p\u003e\n\u003cp\u003eU-Bolt Diameter: 1\/2\"\u003c\/p\u003e\n\u003cp\u003eThread Size: 1\/2\"-20\u003c\/p\u003e","brand":"RunningGearParts.com","offers":[{"title":"Default Title","offer_id":41948045213799,"sku":"SP-UK-PUBR1-GR5-M","price":18.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/files\/RGPProductDisplayMATAPUBR-1_GRADE5_A.png?v=1792001902"},{"product_id":"heavy-duty-trailer-u-bolt-kit-for-5-200-7-000-lb-axles","title":"RGP 5,200-7,000 lb Heavy-Duty Trailer U-Bolt Kit, 3\" Axles, 1\/2\"-20 thread","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis heavy duty U-bolt kit is designed to securely mount 3\" round trailer axles rated from 5,200 to 7,000 lbs, delivering dependable suspension support for a wide range of towing applications. Whether you're servicing a utility trailer, flatbed, or equipment hauler, this kit provides a solid, factory style fit that helps maintain proper axle alignment and ride stability.\u003c\/p\u003e\n\u003cp\u003eManufactured from heat-treated Grade 2 steel, the U-bolts feature precision cut threads for consistent clamping force and long term durability under load. The kit includes all required mounting hardware and is sized to service one axle, making installation straightforward and efficient. Ideal for replacements, upgrades, or new builds, this U-bolt kid offers a reliable, no-hassle solution for keeping your trailer suspension secure and road-ready. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's Include: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e(4) U-bolts - 7\" long with 1\/2\"-20 thread\u003cbr\u003e(2) five-hole U-bolt tie plates - fit 1-3\/4\" or 2\" wide leaf springs\u003cbr\u003e(8) 1\/2\"-20 hex nuts - heavy-duty, easy to torque\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eU-Bolt: 9\/16\"-18 \u003cspan\u003ex 3\" x 7\"\u003cbr\u003eAxle size: 3\" round axle (5,200 lb - 7,000 lb)\u003cbr\u003eSpring width: 1-3\/4\"-2\"\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"RunningGearParts.com","offers":[{"title":"Default Title","offer_id":41957575032935,"sku":"SP-UK-PUBR8-GR5-M","price":28.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/files\/heavy-duty-trailer-u-bolt-kit-for-5-200-7-000-lb-3-axles-reliable-suspension-image-1.png?v=1792001955"},{"product_id":"3-1-2-u-bolt-kit-for-8-000-lbs-round-trailer-axles-7-3-4-long-x-9-16-18-thread","title":"RGP 8,000 lbs Round Trailer Axles U-Bolt kit 3-1\/2\"X 8-1\/2\" Long X 9\/16\"-18 Thread","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eKeep your trailer's suspension secure and stable with this heavy duty U-bolt kit, engineered to support demanding towing applications. Made from raw steel with precision cut threads, these U-bolts deliver exceptional strength and durability to handle heavy trailer loads and resist deformation under stress. \u003c\/p\u003e\n\u003cp\u003eThis complete kit covers one axle, making it easy to replace worn or damaged U-bolts during routine maintenance or suspension rebuilds. By securing the leaf spring assembly firmly to the axle housing, it helps improve suspension stability, ride quality, and overall towing safety. Ideal for utility trailers, equipment haulers, flatbeds, and other trailers that see regular use, this raw steel U-bolt kit is built for reliable performance and long service life when it matters most. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's include: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e4 raw steel U-bolts (#4200-1) \u003c\/p\u003e\n\u003cp\u003e2 tie plates (#4200-3) designed for 2\" wide leaf springs\u003c\/p\u003e\n\u003cp\u003e8 hex nuts (#4203-2) for a tight, reliable fit\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAxle size: 3-1\/2\" round axle (8,000lb)\u003cbr\u003eAxle rating: Typical 8,000 lb axle\u003cbr\u003eSpring width: 2\" \u003cbr\u003eU-Bolt: 9\/16\" -18 x 3-1\/2\" x 8-1\/2\"\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eOEM Replacement: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003ePart numbers included for easy identification and ordering: APUBR-35, #4200-1, #4200-3, #4203-2, and #4203-4.\u003c\/p\u003e","brand":"RunningGearParts.com","offers":[{"title":"Default Title","offer_id":41957575065703,"sku":"SP-UK-PUBR35-GR5-M","price":42.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/files\/d9b51991-5e07-4961-a80a-1ce36fd6add3.png?v=1792568071"},{"product_id":"2000-lb-u-bolt-kit-for-1-3-4-round-axles","title":"RGP 2,000 lb U-Bolt Kit for 1-3\/4\" Round Axles","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview: \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eEnsure a secure and reliable suspension connection with this U-Bolt kit, designed for use with trailer axle spring mounts. This kit includes everything needed to fasten your leaf spring assembly to the axle housing with a tight, factory-style fit. Made from heavy-duty steel and finished for corrosion resistance, the U-Bolts and accompanying hardware deliver strength and durability under load, making them ideal for utility, equipment, cargo, and livestock trailers.\u003c\/p\u003e\n\u003cp\u003eWhether you're rebuilding a suspension, replacing worn components, or performing routine maintenance, this complete kit makes installation straightforward and dependable. It's engineered to match OEM specifications for a snug fit and dependable performance on trailers using compatible leaf spring and axle configurations. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's Include:  \u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e4 x heavy-duty U-bolts\u003cbr\u003e2 x tie plates for 1-3\/4\" wide leaf springs\u003cbr\u003e8 x hex nuts\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAxle diameter: 1-3\/4\"\u003cbr\u003eTypical axle capacity: 2,000 lbs\u003cbr\u003eSpring width: 1-3\/4\"\u003cbr\u003eU-Bolt: 3\/8\" x 4-1\/4\"\u003cbr\u003ehex nuts: 1\/2\"-20\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"RunningGearParts.com","offers":[{"title":"Default Title","offer_id":41957575098471,"sku":"SP-UK-PUBR10-GR5-M","price":15.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/files\/RGPProductDisplayMATAPUBR-10-G_GRADE5_A.png?v=1792001853"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8617\/5079\/collections\/Ubolt_Kits.png?v=1792790009","url":"https:\/\/www.runninggearparts.com\/collections\/u-bolt.oembed","provider":"RunningGearParts.com","version":"1.0","type":"link"}