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

Magorfas 4-leaf double-eye trailer spring set delivers 1,750 lbs of capacity per spring for reliable suspension on 3,500 lb axle trailers.

This Magorfas leaf spring and U-bolt kit is built for utility trailers that use SW4B-style suspension. Each spring is fabricated from high-strength 60Si2Mn manganese steel, finished with a two-coat paint system to resist corrosion, and supplied with the hardware needed to mount to a round axle (2-3/8" beam). The assembly is for trailer use only — not for cars, trucks, vans, tractors, or other motor vehicles.

How long and what are the key dimensions of these leaf springs?

The eye-to-eye length of each spring is 25-1/4" with a free open length of 3" and a leaf width of 1-3/4". Each leaf has a thickness of 5/16" and uses a 9/16" bushing diameter to accept standard suspension bolts. These dimensions are important to confirm fit with your trailer hangers and equalizers before purchase.

• Eye-to-eye length: 25-1/4"
• Free open: 3"
• Leaf width: 1-3/4"; thickness: 5/16"
• Bushing diameter: 9/16"

What load capacity and axle type does this kit support?

Each spring is rated at 1,750 lbs, and the package is sold as a pair providing support for a combined 3,500 lb trailer axle. The included hardware is sized for a round axle with a 2-3/8" beam diameter. Always verify your trailer's required load rating and axle diameter before installing replacement springs.

• Capacity: 1,750 lbs per spring (3,500 lbs per axle as a matched pair)
• Designed for SW4B trailer fitment
• Compatible axle beam: 2-3/8" round

What hardware and accessories come with the U-bolt kit?

The kit includes all mounting hardware needed to attach the leaf pack to the axle: four 5-1/2" U-bolts (1/2" diameter), two tie plates sized for 1-3/4" leaf springs, and eight 1/2"-20 hex nuts. These pieces are matched to the spring width and axle diameter for a secure clamp and correct alignment during installation.

• 4 × 5-1/2" U-bolts, 1/2" diameter
• 2 × tie plates for 1-3/4" leaf springs
• 8 × 1/2"-20 hex nuts

What materials and corrosion protection are used?

Magorfas manufactures these springs from 60Si2Mn manganese spring steel to provide the strength and resilience needed for trailer suspension. The surfaces are finished with two coats of paint to improve resistance against rust and wear in outdoor conditions. Proper installation and periodic inspection will extend service life.

• Material: 60Si2Mn (manganese spring steel)
• Finish: two-coat paint for corrosion resistance
• Designed for durability under typical trailer loads

Who is this for: This Magorfas set is intended for trailer owners, fabricators, and repair shops replacing springs on 3,500 lb round-axle trailers that match SW4B fitment and 25-1/4" eye-to-eye springs. It is not suitable for any passenger vehicles, agricultural tractors, or non-trailer applications. If you need a reliable, factory-style replacement leaf spring and the matching U-bolt hardware for a 2-3/8" axle, this kit provides a complete, like-for-like solution.