{"product_id":"sparkwhiz-trailer-u-bolt-kit-for-3-round-axles-7-1-8-long-1-2-dia-fits-5-200-7-000-lb-trailers","title":"SPARKWHIZ Trailer U-Bolt Kit for 3\" Round Axles — 7 1\/8\" Long, 1\/2\" Dia, Fits 5,200–7,000 lb Trailers","description":"\u003cp\u003e\u003cstrong\u003eSPARKWHIZ Trailer U Bolt Kit is a complete mounting set designed to secure 3\" round axles on 5,200–7,000 lb trailer assemblies using 7 1\/8\" long, 1\/2\" diameter U-bolts and matching plates and hardware.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you need to fasten a heavy-duty trailer axle to leaf springs, the right hardware matters for safety and stability. This SPARKWHIZ kit supplies everything required to clamp a 3\" round axle to standard 1.75\" or 2\" trailer springs: four U-bolts, tie plates sized for 1-3\/4\" springs, and the correct nuts to finish the installation. Built from durable steel with corrosion resistance, the components are sized and specified for axles in the 5,200–7,000 lb range to suit mid-capacity trailers, haulers, and equipment carriers.\u003c\/p\u003e\n\n\u003ch3\u003eWhat components are included and how do they fit together?\u003c\/h3\u003e\n\u003cp\u003eThe kit includes four 7 1\/8\" long U-bolts with a 1\/2\" diameter, eight 1\/2\"-20 hex nuts, and two tie plates sized to pair with 1-3\/4\" leaf springs. Each U-bolt wraps under the axle and through the tie plate so that the nuts draw the assembly tight against the spring pack.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFour U-bolts: 7 1\/8\" length, 1\/2\" diameter\u003c\/li\u003e\n\u003cli\u003eEight hex nuts: 1\/2\"-20 thread pitch\u003c\/li\u003e\n\u003cli\u003eTwo tie plates designed for 1-3\/4\" leaf springs\u003c\/li\u003e\n\u003cli\u003eFits 1.75\" or 2\" spring widths when installed correctly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich axles and trailers is this U-bolt kit compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis kit is intended for round axle beams measuring 3\" in diameter and for axle systems rated between 5,200 and 7,000 pounds. It’s commonly used on single- and tandem-axle utility trailers, boat trailers, and light equipment trailers that use standard leaf springs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAxle beam diameter: 3\" round\u003c\/li\u003e\n\u003cli\u003eWeight capacity range: 5,200–7,000 lbs\u003c\/li\u003e\n\u003cli\u003eSpring compatibility: 1.75\" or 2\" trailer springs\u003c\/li\u003e\n\u003cli\u003eTypical trailer types: utility, boat, equipment, livestock\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I torque and maintain these U-bolts for safe performance?\u003c\/h3\u003e\n\u003cp\u003eTightening to the correct torque prevents loosening and ensures clamping force without overstressing the hardware. The recommended torque range for this kit is 65 to 75 ft-lbs; check torque after initial use and periodically during regular trailer maintenance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTorque specification: minimum 65 ft-lbs, maximum 75 ft-lbs\u003c\/li\u003e\n\u003cli\u003eRecheck torque after first 50–100 miles and at regular service intervals\u003c\/li\u003e\n\u003cli\u003eInspect for corrosion, thread wear, and plate deformation\u003c\/li\u003e\n\u003cli\u003eReplace any bent or heavily corroded parts immediately\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose SPARKWHIZ steel U-bolts over generic fasteners?\u003c\/h3\u003e\n\u003cp\u003eSPARKWHIZ parts are manufactured to match common trailer standards and use thicker steel and protective finishes to resist rust and prolong life under road and weather exposure. Properly sized hardware also helps preserve brake alignment and suspension performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDurable steel construction with corrosion-resistant finish\u003c\/li\u003e\n\u003cli\u003eCorrect sizing reduces risk of spring or axle movement\u003c\/li\u003e\n\u003cli\u003eComplete set eliminates mismatched hardware issues\u003c\/li\u003e\n\u003cli\u003eSupports consistent braking and suspension geometry\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The SPARKWHIZ Trailer U Bolt Kit is aimed at trailer owners, fleet managers, and DIY mechanics who need a ready-to-install, correctly sized U-bolt solution for 3\" axles rated 5,200–7,000 lbs. If you service utility or equipment trailers and want a reliable set of U-bolts, tie plates, and nuts that match common leaf spring widths and torque specifications, this kit is built for you.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this U-bolt kit fit a 3\" axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit is sized for round axles with a 3\" beam diameter and designed for 5,200–7,000 lb systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What torque should I use for installation?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Torque nuts to between 65 and 75 ft-lbs and recheck after the first 50–100 miles of use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SPARKWHIZ","offers":[{"title":"Default Title","offer_id":55167381668183,"sku":"B0CCJ2RY6Q","price":68.27,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/sparkwhiz-front-packaging_632ab4ee-efd6-4d49-9f7b-486e45d8b9f6.jpg?v=1790385410","url":"https:\/\/britishgarage.co.uk\/products\/sparkwhiz-trailer-u-bolt-kit-for-3-round-axles-7-1-8-long-1-2-dia-fits-5-200-7-000-lb-trailers","provider":"British Garage","version":"1.0","type":"link"}