Magorfas 4-Leaf Double-Eye Trailer Spring Set 25-1/4" – 1,750 lb per Spring, Includes U-Bolt Kit

This replacement leaf spring kit is built for single-axle trailers that use SW4B-style suspension. Each spring is manufactured from 60Si2Mn manganese steel for improved toughness and fatigue life, then finished with two layers of corrosion-resistant paint. The set includes two springs plus U-bolts, tie plates, and nuts sized for a 2-3/8" round axle, so you get the spring hardware needed to reinstall quickly.

How does this spring match my trailer's load and axle?

Each leaf spring is rated at 1,750 pounds; two springs pair to support a 3,500-pound axle capacity. Confirm your trailer’s axle rating and the SW4B fitment before ordering to ensure correct capacity and geometry.

• Capacity: 1,750 lb per spring, 3,500 lb per axle when paired
• Designed for SW4B fitment and round axles 2-3/8" diameter
• Eye-to-eye length: 25-1/4" with 3" free arch
• Not intended for cars, trucks, vans, tractors, or non-trailer vehicles

What are the key dimensions and materials I need to know?

The leaf stack is composed of four spring leaves, each 1-3/4" wide and 5/16" thick, with a 9/16" bushing diameter to accept standard pins. The steel alloy and finish are selected to balance strength, flexibility and corrosion resistance for trailer service life.

• Stack: 4 leaves; leaf width 1-3/4"; thickness 5/16"
• Bushing ID: 9/16" to match common shackles and hangers
• Free open (arch): 3" for ride height and load distribution
• Material: 60Si2Mn manganese steel with two-coat painted finish

What comes in the accessory kit and how does it install?

The kit includes four 5-1/2" long U-bolts (1/2" diameter), two tie plates sized for 1-3/4" leaf springs, and eight 1/2"-20 hex nuts — everything needed to clamp the leaf pack to a 2-3/8" round axle beam. Installation follows standard trailer spring replacement steps: secure spring to hanger and shackle, align over axle, clamp with tie plates and U-bolts, then torque nuts to spec.

• Includes 4 x 5-1/2" U-bolts (1/2" dia) and 8 hex nuts
• 2 tie plates sized for 1-3/4" leaf springs ensure proper clamping
• Kit intended for round axle beams 2-3/8" diameter
• Ships as a set of two springs (left + right) for single axle replacement

Who is this for? If you own or maintain single-axle trailers built to SW4B specifications and need a reliable replacement leaf spring rated for 1,750 lb per spring, this Magorfas kit is designed for that purpose. It is ideal for trailer owners, fleet managers, and repair shops replacing worn or broken trailer springs on utility, boat, landscape, or enclosed cargo trailers. Do not use this product on passenger cars, trucks, vans, tractors or any vehicle other than the trailer types specified.