{"product_id":"aeagle-25-1-4-4-leaf-double-eye-trailer-spring-kit-1-750-lb-per-spring-3-free-open-includes-u-bolts-tandem-hanger-4-pcs","title":"Aeagle 25-1\/4\" 4-Leaf Double-Eye Trailer Spring Kit — 1,750 lb per Spring, 3\" Free-Open, Includes U-Bolts \u0026 Tandem Hanger (4 PCS)","description":"\u003cp\u003e\u003cstrong\u003eAEagle 25-1\/4\" 4-leaf double-eye spring kit supplies 1,750 lb capacity per spring and includes U-bolts and a tandem hanger set to support a 3,500 lb trailer axle.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis complete suspension kit is a direct-fit replacement for round-axle 3,500 lb trailer systems that accept SW4B-style springs. Each steel spring measures 25-1\/4\" eye-to-eye, has a 3\" free-open length and four leaves built on a 1.75\" top-width with 5\/16\" leaf thickness. The kit bundles four springs, mounting hardware, U-bolts sized for 2-3\/8\" round axles, tie plates, and a tandem hanger\/equalizer pack so you receive everything needed for a coordinated axle installation.\u003c\/p\u003e\n\n\u003ch3\u003eWill these springs fit my trailer axle?\u003c\/h3\u003e\n\u003cp\u003eThese AEagle springs are designed for round trailer axles only and replace SW4B-style parts. They are not compatible with square axles; confirm your axle is 2-3\/8\" round diameter and your trailer rating matches 3,500 lb axles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEye-to-eye length: 25-1\/4\"\u003c\/li\u003e\n  \u003cli\u003eFree-open length: 3\"\u003c\/li\u003e\n  \u003cli\u003eTop leaf width: 1.75\"; leaf thickness: 5\/16\"\u003c\/li\u003e\n  \u003cli\u003eCapacity: 1,750 lb per spring (4 springs for 3,500 lb axle setups)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat hardware is included and how does it help installation?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains all primary mounting pieces so you won’t need to source staples separately. Included are U-bolts, tie plates, hex nuts, two equalizers, hangers, shackle straps, and shackle bolts with locknuts to assemble a tandem axle suspension layout.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eU-bolts: 8 × 5-1\/2\" long, 1\/2\" dia, thread length 1.97\"\u003c\/li\u003e\n  \u003cli\u003eTie plates: 4 plates sized for 1-3\/4\" leaf springs\u003c\/li\u003e\n  \u003cli\u003eTandem hardware: 2 equalizers, 6 hangers, 8 shackle straps, shackle bolts and locknuts\u003c\/li\u003e\n  \u003cli\u003eNuts: 16 × 1\/2\"-20 hex nuts for secure clamping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and long-lasting are these components?\u003c\/h3\u003e\n\u003cp\u003eAEagle forms these springs from quality raw steel and applies an anti-rust coating for improved corrosion resistance in road and storage conditions. Every kit is tested before shipping and backed by a 12-month warranty for added confidence.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAnti-rust coating on springs and hardware\u003c\/li\u003e\n  \u003cli\u003eHigh-quality steel construction chosen for strength\u003c\/li\u003e\n  \u003cli\u003ePre-shipment testing and 12-month warranty included\u003c\/li\u003e\n  \u003cli\u003eTwo 9\/16\" bushings installed per spring for reduced wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there installation tips or important notes to know?\u003c\/h3\u003e\n\u003cp\u003eFollow torque and alignment guidance for best ride and safety performance; tighten the included nuts horizontally as specified to avoid uneven forces. Verify shackle bolt lengths and confirm equalizer orientation when assembling the tandem hangers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTighten nuts horizontally to ensure proper spring seating\u003c\/li\u003e\n  \u003cli\u003eConfirm equalizer and hanger placement for tandem axles\u003c\/li\u003e\n  \u003cli\u003eMatch bushings and bolt sizes included to your mounting hardware\u003c\/li\u003e\n  \u003cli\u003eNot suitable for square axles—only round 2-3\/8\" diameter axles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This AEagle suspension kit is intended for trailer owners, small-fleet operators, and DIY mechanics who need a full replacement leaf-spring assembly for a 3,500 lb-rated round axle. It’s especially useful when you want a complete set—springs plus U-bolts and tandem hanger hardware—delivered together for straightforward installation and dependable on-road performance.\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: Can these springs be used on a square axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. These AEagle springs are designed for 2-3\/8\" round trailer axles and are not compatible with square axles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include all mounting hardware for tandem axles?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The package includes U-bolts, tie plates, equalizers, hangers, shackle straps, bolts, and nuts for a tandem setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Aeagle","offers":[{"title":"Default Title","offer_id":48082887508126,"sku":"B0C1Z279T8","price":298.97,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/aeagle-front-packaging-springs_8618c45b-5bd1-49bc-af0e-fcdac8674dc2.jpg?v=1785818114","url":"https:\/\/northtrailauto.ca\/products\/aeagle-25-1-4-4-leaf-double-eye-trailer-spring-kit-1-750-lb-per-spring-3-free-open-includes-u-bolts-tandem-hanger-4-pcs","provider":"North Trail Auto","version":"1.0","type":"link"}