Aeagle 4-Leaf Double Eye Trailer Spring Kit — 25-1/4" Length, 1,750 lb Per Spring, Includes U-Bolts & Hangers

AEagle 4-leaf double-eye trailer springs — a heavy-duty suspension kit providing 1,750 lb capacity per spring (3,500 lb axle) with U-bolts, hangers and hardware for 2-3/8" round trailer axles.

Designed as a direct-style replacement for SW4B-type setups (note: fits round, not square, axles), this AEagle suspension kit includes two 4-leaf springs and a full mounting hardware set so you can restore trailer ride height, load support and leaf-pack stability. Each spring measures 25-1/4" eye-to-eye, has a 3" free length, and a 1-3/4" leaf width with solid bushings pre-installed. The package arrives pre-tested and protected with an anti-rust coating for long-term corrosion resistance.

How will this kit fit my trailer axle?

The kit is engineered for round trailer axles with a 2-3/8" diameter and is intended as a replacement for part number SW4B. Confirm axle shape and U-bolt dimensions before ordering to ensure compatibility.

• Fits 2-3/8" round trailer axles only — not compatible with square axles.
• Spring eye-to-eye length: 25-1/4"; free open height: 3".
• Includes U-bolts sized for standard 3,500 lb trailer axles (4 x 5-1/2" long, 1/2" dia.).
• Two springs in the set provide 1,750 lb capacity each for a combined axle rating of 3,500 lb.

What hardware and hangers come with the suspension kit?

AEagle bundles the springs with a complete hanger and U-bolt kit so you have the fasteners and mounting plates required to reinstall the axle. The kit covers both front and rear mounting points and includes shackle hardware for a full suspension assembly.

• U-bolt kit: 4 x 5-1/2" long U-bolts, 1/2" diameter, 8 x 1/2"-20 hex nuts, tie plates for 1-3/4" leaf springs.
• Hanger set: 2 x 3" tall hangers, 2 x 2.1" tall hangers, 4 shackle straps (3.09" eye-to-eye).
• Shackle bolts and locknuts: 6 x 9/16"-18 x 3" long bolts with locknuts for secure installation.
• Two bushings are factory-installed per spring (9/16" bushing diameter).

How durable and reliable are these leaf springs?

Each AEagle leaf spring is manufactured from high-grade raw material and finished with an anti-rust coating to resist corrosion in road and storage environments. Springs are quality-checked before dispatch and backed by a limited warranty.

• Leaf thickness: 5/16" per leaf; 4 leaves per spring for balanced load distribution.
• Protective anti-corrosion coating prevents premature rusting in wet conditions.
• Tested prior to shipping; AEagle provides a 12-month warranty on workmanship.
• Assembly note: tighten nuts horizontally to avoid affecting final performance.

Who is this for? This AEagle 4-leaf double-eye suspension kit is suited to trailer owners, fleet operators, and DIY mechanics who need a dependable replacement for worn or damaged leaf springs on single 3,500 lb axles with 2-3/8" round tubing. Choose this kit if you want a complete hardware package—springs, U-bolts, hangers and shackles—so you can complete a full axle suspension service without sourcing parts separately. Verify axle shape and dimensions before purchasing to ensure a trouble-free fit.