{"product_id":"siapupy-trailer-leaf-spring-kit-3-5k-7-2k-axles-heavy-duty-corrosion-resistant-shackle-equalizer-set","title":"Siapupy Trailer Leaf Spring Kit 3.5K–7.2K Axles — Heavy-duty Corrosion-Resistant Shackle \u0026 Equalizer Set","description":"\u003cp\u003e\u003cstrong\u003eSiapupy Heavy-Duty Trailer Shackle Leaf Spring Kit is a complete, corrosion-resistant replacement set engineered to restore tandem-axle trailer suspension performance for 3,500–7,200 lb axles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis comprehensive kit supplies the core hardware and components you need to repair or replace double-eye leaf spring suspensions on utility, boat, and cargo trailers. Built from steel with an anti-rust finish, the parts are designed for routine road use and saltwater exposure. The package includes equalizers, shackle straps, bushings, bolts, and locking nuts sized to fit common trailer hanger and spring configurations, so you can complete a dependable repair in a home garage or professional shop.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this kit fit my trailer's suspension?\u003c\/h3\u003e\n\u003cp\u003eThe Siapupy kit is matched to double-eye, tandem-axle setups rated between 3,500 and 7,200 pounds per axle. Key measurements are designed to align with standard trailer spring hangers and equalizer positions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEqualizer hole spacing: 7-3\/4\"\u003c\/li\u003e\n  \u003cli\u003eShackle strap length: 4.38\" with 3-1\/8\" (3.12\") hole spacing\u003c\/li\u003e\n  \u003cli\u003eBushing I.D.: 9\/16\"; O.D.: 11\/16\"\u003c\/li\u003e\n  \u003cli\u003eBolt length: 3-3\/8\" with 9\/16\"-18 thread; locking nuts included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included and why each matters?\u003c\/h3\u003e\n\u003cp\u003eThis set bundles the critical suspension pieces so you don’t need to source multiple components separately. Each item supports proper alignment, load transfer, and wear resistance in a trailer suspension system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2 long triangular equalizers — balance spring loads between axles\u003c\/li\u003e\n  \u003cli\u003e8 shackle straps — connect springs to hangers while allowing movement\u003c\/li\u003e\n  \u003cli\u003e8 nylon leaf spring bushings — reduce metal-on-metal wear and noise\u003c\/li\u003e\n  \u003cli\u003e14 shackle bolts and 14 locking nuts — secure fasteners that resist loosening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and corrosion-resistant are these components?\u003c\/h3\u003e\n\u003cp\u003eSiapupy uses steel construction with an anti-rust coating to extend service life under road and marine-adjacent conditions. The finish and materials focus on reducing common wear points and maintaining fit over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel parts for strength under regular towing loads\u003c\/li\u003e\n  \u003cli\u003eProtective anti-rust coating to resist salt and moisture exposure\u003c\/li\u003e\n  \u003cli\u003eLocking nuts engineered to hold torque under vibration\u003c\/li\u003e\n  \u003cli\u003eNylon bushings to limit abrasion and isolate shock\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation for DIYers and mechanics?\u003c\/h3\u003e\n\u003cp\u003eThe kit is supplied as a ready set of matched parts, simplifying part selection and reducing trips to the hardware store. Basic tools for trailer suspension work and routine shop procedures are all that’s required for installation or replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAll necessary fasteners and bushings included in one box\u003c\/li\u003e\n  \u003cli\u003eFits standard trailer hangers and double-eye springs without modification in most cases\u003c\/li\u003e\n  \u003cli\u003eCan be installed in a home garage or professional workshop\u003c\/li\u003e\n  \u003cli\u003eLocking nuts help avoid re-torquing under normal conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Siapupy Heavy-Duty Trailer Shackle Leaf Spring Kit is ideal for trailer owners, fleet maintainers, and repair shops that need a reliable, ready-to-install suspension parts package for tandem-axle utility, boat, or cargo trailers in the 3,500–7,200 lb range. Whether you’re replacing worn shackles and bushings after years of service or rebuilding a suspension during restoration, this kit groups the correct sizes and corrosion-resistant components to finish the job efficiently.\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 kit fit my tandem axle trailer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes if your trailer uses double-eye leaf springs and axles rated between 3,500–7,200 lbs; check equalizer and shackle measurements to confirm fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the nuts vibration-resistant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes; the included lock nuts compress to expand center threads, helping resist loosening from road vibration.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Siapupy","offers":[{"title":"Default Title","offer_id":55168724107607,"sku":"B0FK5D144D","price":80.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/siapupy-kit-laid-out-full-set.jpg?v=1790412638","url":"https:\/\/britishgarage.co.uk\/products\/siapupy-trailer-leaf-spring-kit-3-5k-7-2k-axles-heavy-duty-corrosion-resistant-shackle-equalizer-set","provider":"British Garage","version":"1.0","type":"link"}