Aeagle 4-Leaf Double Eye Spring Kit for 3500lb Trailer Axle (25-1/4 in L, 1-3/4 in W) – 2-Piece, U-Bolt & Hanger Kit

Upgrade your trailer suspension with the Aeagle 4-Leaf Double Eye Spring Kit

Designed for resilience and reliable towing, this kit combines two high-capacity springs with a complete hardware set to support a 3,500 lb trailer load. It is tailored for round axles and 2-3/8 in diameter, delivering a balanced, steady ride on the road.

The 4-leaf, double-eye design distributes weight across the leaf pack, helping to minimize sag under load and improve stability during cornering and braking. The kit pairs the springs with a full U-bolt and hanger assembly, so you have a ready-to-install solution that covers both suspension and mounting hardware.

Whats included

• 2 x 4-leaf double-eye springs
• 3,500 lb axle U-bolt kit for 2-3/8 in round axles
• Complete single trailer axle hanger kit with all mounting hardware

• U-bolts: four pieces, 5-1/2 in long, diameter 1/2 in
• Tie plates for 1-3/4 in leaf springs
• Hex nuts: eight pieces, 1/2 in-20
• Hanger kit: two 3 in tall hangers and two 2.1 in tall hangers
• Shackle straps: four, eye to eye 3.09 in
• Shackle bolts and locknuts: six 9/16 in-18 x 3 in

Key specifications

• Capacity per spring: 1,750 lb
• Total capacity: 3,500 lb for a two-spring setup
• Eye-to-eye length: 25-1/4 in
• Free open: 3 in
• Leaf width: 1-3/4 in
• Leaves: 4 per spring
• Bushing diameter: 9/16 in
• Note: Tighten the nut horizontally for best fit

Durability, quality, and warranty

Each component features an anti-rust coating to resist corrosion, while manufacturing uses high-quality raw materials intended for longevity. The kit is tested before shipping and carries a 12-month warranty for extra confidence.

Fitment and usage tips

Designed to replace SW4B and to fit round axles (not square). It is compatible with 1-3/4 in leaf springs, and the included hardware makes installation straightforward for DIY trailer projects or professional upgrades.