Description

This pair of 4-leaf trailer springs offers reliable, medium-duty support for trailers needing a balance of strength and smooth handling. With a 1,000 kg axle rating, they’re well-suited for tandem axle setups or lighter single axle builds such as tradesman trailers or small plant carriers.

Manufactured from 50 mm wide, 6 mm thick high-tensile steel, these springs feature progressive spring compression for responsive load handling, a longer second leaf for improved durability, and come pre-installed with hard-wearing nylon bushes. The Zinctech coating adds long-term corrosion resistance, making these springs a dependable option for new trailers or suspension upgrades.

Key Features

  • Load capacity: 1,000 kg per axle (pair)
  • 4-leaf configuration designed for strength and stability
  • Progressive spring compression for smoother ride and load control
  • Longer second leaf reinforces the main leaf and reduces stress points
  • Made from high-tensile 50 mm x 6 mm steel
  • Coated in Zinctech anti-corrosion finish
  • Includes pre-installed nylon bushes for low-maintenance use

Applications

  • Tradesman trailers
  • Campers and custom builds
  • Equipment and general-purpose hauliers

Specifications

  • Trailer Spring Type: Eye-to-slipper leaf spring
  • Number of Leaves: 4 per spring
  • Width: 50 mm
  • Leaf Thickness: 6 mm
  • Bushes: Nylon, pre-installed
  • Load Capacity: 1,000 kg per pair
  • Spring finish: Zinctech corrosion-resistant coating
  • Inclusions: One pair of springs

FAQs

Q: What is progressive spring compression?

A: Unlike linear springs that compress at a constant rate, a progressive spring features leaves designed to increase stiffness as they compress. This design allows the trailer spring to provide a smoother ride under light loads while offering greater support under heavier loads. As a result, it delivers better control across varying conditions and helps prevent excessive sag. This dual-rate behaviour allows your trailer to handle a wider range of load conditions without sacrificing control, ride quality, or safety. It also helps reduce wear on other suspension components and minimises the risk of bottoming out under heavy loads.

Q: What is Zinctech coating?

A: Zinctech is a specialised corrosion-resistant zinc coating applied to steel components. It offers strong protection against rust, extending the life of springs and hardware in outdoor environments.

Q: Why is the second leaf longer?

A: A longer second leaf supports the main leaf, reducing stress on the eye area and extending the trailer spring's service life.

Q: What are anti-rattle leaves?

A: Anti-rattle leaves are designed to minimise movement and noise in a leaf spring suspension system. At the slipper end, the spring leaves are spread out (or "fanned") rather than stacked tightly together. This creates a snug fit inside the slipper, which helps reduce rattling, wear, and vibration during towing.

Q: Can I get axles with this kit?

Yes. You can add ready-made axles or custom fabricated axles to your order. To get axles made to your specifications, please visit: https://www.treadway.co.nz/Resources/Axle-Fabrication.html

Q: Does this kit include mounting hardware?

A: This listing includes one pair of springs only. Mounting components like bolts, hangers, and slippers are sold separately, but spring sets with mounting components are also available here at Treadway.

Visit this page for spring sets with different load ratings: https://www.treadway.co.nz/shop/components/Trailer+Suspension.html?range=0-24

For accessories: https://www.treadway.co.nz/shop/trailer-accessories.html

Questions?

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