{"product_id":"trailer-leaf-spring-4-leaf-double-eye-1750-lb-capacity-set-of-2","title":"Trailer Leaf Spring 4 Leaf Double Eye 1750 lb Capacity - Set of 2","description":"\u003cp\u003eIn this review the focus is on a pair of trailer leaf springs intended for single-axle 3500 lb trailer setups. The bottom line: these 4-leaf, double-eye springs are a straightforward replacement option when a trailer is sagging, bouncing excessively, or carrying uneven loads, and they deliver the core purpose-restoring suspension capacity-reliably. Our review finds the springs best for trailer owners who need a direct, robust swap for SW4B-fit axles and who value corrosion resistance and solid spring strength over cosmetic finishes.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Leaf Construction:\u003c\/strong\u003e Provides layered strength and controlled flex for consistent load support on a 3500 lb axle when installed as a pair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1750 lb Capacity per Spring:\u003c\/strong\u003e Each spring is rated to carry 1750 lb, which together supports standard 3500 lb trailer axles when load ratings match the trailer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-1\/4' Eye-to-Eye Length:\u003c\/strong\u003e The 25-1\/4' eye-to-eye length makes these springs a direct fit for applications specified as SW4B, simplifying replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60Si2Mn Manganese Steel:\u003c\/strong\u003e Built from heat-treatable manganese steel for improved strength, flexibility, and resistance to permanent deformation under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-Coat Painted Surface:\u003c\/strong\u003e The painted finish provides basic corrosion resistance to extend service life in typical trailer environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple Bushing Size:\u003c\/strong\u003e With a 9\/16' bushing diameter they fit common mount hardware on compatible trailer axles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese springs are aimed at trailer owners, maintenance shops, and DIY mechanics who need a reliable, like-for-like replacement for worn or damaged springs on 3500 lb trailer axles that accept SW4B fitment. They suit utility trailers, small equipment trailers, and boat trailers where restoring ride height and load handling is the priority.\u003c\/p\u003e\n\u003cp\u003eThese are not for automobiles, trucks, vans, tractors, or any vehicle other than trailers; buyers seeking suspension parts for road vehicles should look elsewhere. Also check load ratings carefully-if your trailer carries loads above the rated capacity, consider a heavier-duty spring or a different suspension solution.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGood build quality from 60Si2Mn steel gives reliable spring strength and flexibility under load.\u003c\/li\u003e\n\u003cli\u003eDirect fit for SW4B setups with standard 25-1\/4' eye-to-eye sizing and 9\/16' bushing diameter.\u003c\/li\u003e\n\u003cli\u003eTwo coats of paint improve corrosion resistance for longer service life on trailered equipment.\u003c\/li\u003e\n\u003cli\u003eCustomers report straightforward installation and consistent functionality as replacement springs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot suitable for any automobiles or on-road vehicle suspension uses; strictly trailer-only.\u003c\/li\u003e\n\u003cli\u003eValue perceptions vary among customers, so cost versus long-term durability may be judged differently.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeaves\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye-to-eye length\u003c\/td\u003e\n\u003ctd\u003e25-1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFree open\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeaf width\u003c\/td\u003e\n\u003ctd\u003e1-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBushing diameter\u003c\/td\u003e\n\u003ctd\u003e9\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeaf thickness\u003c\/td\u003e\n\u003ctd\u003e5\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad capacity\u003c\/td\u003e\n\u003ctd\u003e1750 lb per spring (3500 lb axle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThis pair of 4-leaf, 1750 lb trailer springs is a practical, no-frills replacement for trailers that use SW4B fitment and need restored ride height and load support. The manganese steel construction and painted finish make them a durable option for routine trailer use, and they represent sensible value for anyone needing a direct swap rather than an upgrade to a heavier system.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these fit my trailer?\u003c\/strong\u003e\u003cbr\u003eThey fit trailers specified for SW4B with a 25-1\/4 in eye-to-eye requirement; confirm the axle and mounting hardware match the 9\/16 in bushing diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used on cars or trucks?\u003c\/strong\u003e\u003cbr\u003eNo, these springs are designed only for trailers and are not suitable for automobiles, trucks, vans, or tractors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much weight does each spring support?\u003c\/strong\u003e\u003cbr\u003eEach spring is rated at 1750 lb, so a matched pair supports a 3500 lb axle when installed and matched to the trailer's load requirements.\u003c\/p\u003e","brand":"Magorfas","offers":[{"title":"Default Title","offer_id":48618748281051,"sku":"B0BY8PWW3Y","price":64.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61XLswGlkKL._AC_SL1500.jpg?v=1778518391","url":"https:\/\/gearmusthave.com\/products\/trailer-leaf-spring-4-leaf-double-eye-1750-lb-capacity-set-of-2","provider":"GearMustHave","version":"1.0","type":"link"}