Description

This pair of 3-leaf trailer springs offers a reliable suspension solution for small to medium-duty trailers. With a load rating of 750 kg per axle, they’re perfect for box trailers, camper builds, and general-purpose towing applications.

Each spring is made from 50 mm wide, 6 mm thick high-tensile steel, coated with a Zinctech anti-corrosion finish for long-lasting protection. The anti-rattle leaves ensure a quieter ride, and together with the longer second leaf, provide additional strength and stability. These springs also come with pre-installed hard-wearing nylon bushes for ease of installation.

Key Features

  • Load capacity: 750 kg per axle (pair)
  • 3-leaf configuration for medium-duty trailer use
  • Progressive spring compression for a smoother ride
  • Longer second leaf enhances durability under load
  • Manufactured from high-tensile 6 mm thick steel
  • 50 mm wide leaves for compatibility with common hangers and fittings
  • Zinctech finish on springs protects against corrosion
  • Includes pre-installed hard-wearing nylon bushes

Applications

  • Box trailers
  • Camping trailers
  • Small tradesman trailers
  • Light machinery or equipment transport
  • Recreational and DIY trailer projects

Specifications

  • Trailer Spring Type: Eye-to-slipper leaf spring
  • Number of Leaves: 3 per spring
  • Width: 50 mm
  • Leaf Thickness: 6 mm
  • Load Capacity: 750 kg per pair
  • Spring finish: Zinctech anti-corrosion 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

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