Upgrade your trailer's suspension with this complete 3,500 lb Spring Leaf and U-Bolt Kit from TRAILER SUPPLIES. Each kit includes two heavy-duty 4-leaf double eye springs and a full U-bolt mounting set—everything needed to restore or enhance your trailer's suspension. Built for Performance The leaf springs are made from 60Si2Mn high-tensile manganese steel for excellent strength, flexibility, and resistance to fatigue and corrosion. Each spring supports 1,750 lbs, delivering a combined load capacity of 3,500 lbs—ideal for single axle trailers hauling equipment, cargo, or boats. Secure Mounting with U-Bolt Kit This set includes (4) 2-3/8" round U-bolts, (2) tie plates, and (8) hex nuts with lock washers. All parts are zinc-coated to withstand harsh outdoor conditions and provide long-lasting durability. Exact Fitment Spring dimensions: 25-1/4" length, 1-3/4" width, 9/16" bushing ID, with 3" free arch height. Pre-installed nylon bushings reduce installation time. Fully compatible with OEM part numbers like SW4B, 72-42, PR4B, 93184, and more.