{"product_id":"sehnsucht-trailer-leaf-spring-kit-2-piece-1-750-lb-double-eye-springs-with-u-bolts-hangers-for-3-500-lb-axle","title":"SEHNSUCHT trailer leaf spring kit — 2-piece 1,750 lb double-eye springs with U-bolts \u0026 hangers for 3,500 lb axle","description":"\u003cp\u003e\u003cstrong\u003eSEHNSUCHT's kit delivers two 1,750 lb double-eye leaf springs plus U-bolts and hangers designed to restore a 3,500 lb single-axle trailer suspension.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement bundle contains everything needed to upgrade or repair a standard 3,500 lb trailer axle: two four-leaf springs built for 1,750 lb each, a matched U-bolt and tie plate set sized for 2 3\/8\" round axles, and a complete hanger\/shackle assortment for 1-3\/4\" leaf packs. Components are heat-treated carbon steel with an anti-corrosion finish and come with installed bushings for quicker installation. The kit is intended as a direct substitute for SW4B-style springs and includes clear hardware counts and dimensions so you can confirm fit before purchase.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these springs match my trailer's capacity?\u003c\/h3\u003e\n\u003cp\u003eEach spring in this set is rated for 1,750 lb, so the paired assembly supports a typical 3,500 lb single trailer axle when mounted as intended. Ratings assume even load distribution across the axle and correct installation with supplied hardware.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePer-spring capacity: 1,750 lb\u003c\/li\u003e\n  \u003cli\u003eIntended axle rating: 3,500 lb (combined)\u003c\/li\u003e\n  \u003cli\u003eLeaf pack: 4 leaves, 5\/16\" thickness per leaf\u003c\/li\u003e\n  \u003cli\u003eDesigned as direct SW4B replacements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat exact dimensions and fittings are included?\u003c\/h3\u003e\n\u003cp\u003eThe springs measure 25-1\/4\" eye-to-eye with a 3\" free arch and 1-3\/4\" leaf width; each spring includes two 9\/16\" bushings already installed. The U-bolt kit fits 2 3\/8\" round axles and the hanger kit contains both tall and short hangers plus shackle straps and bolts for standard mounting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpring eye-to-eye: 25-1\/4\"; free arch: 3\"\u003c\/li\u003e\n  \u003cli\u003eLeaf width: 1-3\/4\"; bushing dia: 9\/16\" (2 per spring)\u003c\/li\u003e\n  \u003cli\u003eU-bolts: 4 × 5-1\/2\" long, 1\/2\" thread; inside curvature ≈ 2.44\"\u003c\/li\u003e\n  \u003cli\u003eHangers: 2 × 3\" tall, 2 × 2.1\" tall; shackle straps and bolts included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and corrosion protection are used?\u003c\/h3\u003e\n\u003cp\u003eThe spring leaves are constructed from heavy-duty carbon steel and undergo heat treatment to maintain load stability and resist deformation. An extra anti-rust coating is applied to exposed steel surfaces to extend service life in wet or salty environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: heat-treated carbon steel for durability\u003c\/li\u003e\n  \u003cli\u003eFinish: anti-corrosion coating on leaves and hardware\u003c\/li\u003e\n  \u003cli\u003eBushings: 9\/16\" diameter, pre-installed for faster assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich parts of the kit require attention during installation?\u003c\/h3\u003e\n\u003cp\u003eProper torque orientation is important for the supplied nuts—tighten horizontally to ensure the hardware seats correctly and to avoid altering spring behavior. Also verify axle diameter and hanger alignment before final tightening to prevent premature wear or misalignment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTighten nuts horizontally as instructed to maintain performance\u003c\/li\u003e\n  \u003cli\u003eConfirm axle is 2 3\/8\" diameter for U-bolt compatibility\u003c\/li\u003e\n  \u003cli\u003eCheck hanger and shackle positions for correct spring alignment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This SEHNSUCHT kit is intended for trailer owners, repair shops, and fleet managers needing a complete SW4B-style replacement for a 3,500 lb single axle. It suits users who want pre-bushed springs and a full hardware set—ideal when replacing both springs and mounting hardware to restore ride height, stability, and safe load carrying on utility, boat, landscape, or enclosed trailers.\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 these springs fit my SW4B trailer axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this kit replaces SW4B-style springs; confirm your axle is a 2 3\/8\" round axle and leaf width 1-3\/4\" for proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are bushings included and pre-installed?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, each spring comes with two 9\/16\" bushings already installed for faster assembly and correct alignment.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SEHNSUCHT","offers":[{"title":"Default Title","offer_id":48080737206430,"sku":"B0BX69T1FC","price":163.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sehnsucht-front-view-kit.jpg?v=1785784827","url":"https:\/\/northtrailauto.ca\/products\/sehnsucht-trailer-leaf-spring-kit-2-piece-1-750-lb-double-eye-springs-with-u-bolts-hangers-for-3-500-lb-axle","provider":"North Trail Auto","version":"1.0","type":"link"}