{"product_id":"siapupy-trailer-shackle-leaf-spring-kit-for-3-500-7-200-lb-tandem-axles-complete-steel-corrosion-resistant-set","title":"Siapupy Trailer Shackle \u0026 Leaf Spring Kit for 3,500–7,200 lb Tandem Axles — Complete Steel Corrosion-Resistant Set","description":"\u003cstrong\u003eSiapupy Heavy-Duty Trailer Shackle Leaf Spring Kit provides a complete set of steel shackles, equalizers, bolts, nuts and bushings designed to service double-eye leaf spring tandem axles rated from 3,500 to 7,200 lb.\u003c\/strong\u003e\n\n\u003cp\u003eIf you maintain or rebuild utility, boat, or cargo trailers with double-eye leaf springs, this Siapupy kit bundles the common suspension replacement parts you need in one package. Each component is finished to resist corrosion and sized to match common trailer hardware, so mechanics and DIYers can replace worn shackles, equalizers, or bushings without hunting down individual pieces.\u003c\/p\u003e\n\n\u003ch3\u003eWhat parts are included and how many of each come in the set?\u003c\/h3\u003e\n\u003cp\u003eThe kit is an all-in-one collection of suspension hardware so you can complete most tandem-axle leaf spring repairs. It contains multiple shackles, equalizers, bolts, locking nuts and bushings to replace both sides of a tandem setup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2 long triangular equalizers with 7-3\/4\" hole spacing\u003c\/li\u003e\n  \u003cli\u003e8 shackle straps — 4.38\" length with 3-1\/8\" (3.12\") hole spacing\u003c\/li\u003e\n  \u003cli\u003e8 nylon leaf spring bushings (9\/16\" I.D., 11\/16\" O.D.)\u003c\/li\u003e\n  \u003cli\u003e14 shackle bolts (3-3\/8\" long) and 14 nylon-insert locking nuts with 9\/16\"-18 thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the kit fit common trailer leaf spring systems?\u003c\/h3\u003e\n\u003cp\u003eThe dimensions and thread sizes are chosen to match widely used double-eye leaf spring hardware on utility, boat, and cargo trailers. Check the listed measurements against your trailer’s existing parts to ensure compatibility before installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for axles rated 3,500–7,200 lb (tandem-axle applications)\u003c\/li\u003e\n  \u003cli\u003eEqualizer hole center-to-center: 7-3\/4\" for standard tandem spring spacing\u003c\/li\u003e\n  \u003cli\u003eShackle strap spacing: 3-1\/8\" (3.12\") with 4.38\" overall strap length\u003c\/li\u003e\n  \u003cli\u003eBolt length 3-3\/8\" and common 9\/16\"-18 thread pitch\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and finishes are used, and what performance can I expect?\u003c\/h3\u003e\n\u003cp\u003eComponents are manufactured from robust steel and treated with a corrosion-resistant coating to extend service life in road, wet or saltwater environments. Nylon bushings reduce metal-on-metal wear and help maintain smooth pivoting under load.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel shackles and equalizers for structural strength\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant finish to slow rust in marine and road conditions\u003c\/li\u003e\n  \u003cli\u003eNylon bushings help reduce friction and wear at pivot points\u003c\/li\u003e\n  \u003cli\u003eLocking nuts resist loosening under vibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will this kit simplify repairs or upgrades in my garage or shop?\u003c\/h3\u003e\n\u003cp\u003eThis packaged set reduces time spent sourcing individual parts and ensures you replace matched components, which helps restore correct suspension geometry. The quantity of pieces lets you service both sides of a tandem axle and keep spares on hand for future maintenance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete replacement set for tandem-axle leaf spring suspensions\u003c\/li\u003e\n  \u003cli\u003eMatches common factory dimensions for straightforward swaps\u003c\/li\u003e\n  \u003cli\u003eSupplies extra bolts and nuts so you can finish installations without delay\u003c\/li\u003e\n  \u003cli\u003eWorks well alongside leaf spring hangers and trailer chassis repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Siapupy Heavy-Duty Trailer Shackle Leaf Spring Kit is intended for trailer owners, repair shops, fleet managers and DIY mechanics who need a reliable set of suspension components for utility, boat or cargo trailers with double-eye leaf springs. If your trailer axle rating falls between 3,500 and 7,200 lb and your existing hardware matches the listed dimensions and threads, this kit gives you the parts and corrosion protection to complete a thorough repair or preventative upgrade.\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 trailer axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If your trailer uses double-eye leaf springs and the axle rating is 3,500–7,200 lb, compare the listed hole spacings and 9\/16\"-18 threads to your existing parts for compatibility.\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 kit includes nylon-insert locking nuts designed to resist loosening under trailer vibration and road conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Siapupy","offers":[{"title":"Default Title","offer_id":48086740631710,"sku":"B0FK5D144D","price":57.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/siapupy-front-packaging-kits.jpg?v=1785903269","url":"https:\/\/northtrailauto.ca\/products\/siapupy-trailer-shackle-leaf-spring-kit-for-3-500-7-200-lb-tandem-axles-complete-steel-corrosion-resistant-set","provider":"North Trail Auto","version":"1.0","type":"link"}