Axles & Suspension Spring Kits Single Axle Spring Kits

Spring Set Single Axle 1250kg Zinctech Inc ubolts & plates to suit 50mm axle

NZ $275.90 excl GST
SKU: 61053
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Description

This single-axle trailer spring set with U-bolts and axle plates is a heavy-duty, complete suspension solution designed for trailers using a 50 mm square axle. This kit includes 5-leaf slipper springs with Zinctech corrosion protection, mounting hardware, and durable axle connection components for secure, long-lasting performance.

Built to support up to 1,250 kg gross axle mass, these springs feature a progressive spring compression design, a longer second leaf for improved support, and anti-rattle leaves that minimise wear and vibration during use. Ideal for medium-duty trailers where reliable load handling and ease of installation are key.

Key Features

  • Anti-rattle leaf design reduces noise and vibration
  • Progressive spring compression for improved ride and load response
  • Longer second leaf increases spring durability
  • Nylon bushes pre-installed for quick setup
  • Includes U-bolts and axle plates to suit 50 mm box axle

Applications

  • General-purpose and medium-duty trailers
  • Equipment transporters
  • Box and tradesman trailers

Specifications

  • Load Rating: 1,250 kg per axle (pair)
  • Trailer Spring Type: Eye-to-slipper
  • Number of Leaves: 5 per spring
  • Spring Width: 50 mm
  • Leaf Thickness: 6 mm
  • Spring finish: Zinctech coating
  • Bushes: Nylon, pre-installed

Kit Inclusions

  • 60003 Springs Only 1,250 kg Zinctech 5 Leaf (1 pair)
  • 60023 Galvanised  U-Bolt 123L x 51W M12 suits 50 mm box (4 pieces)
  • 60016 Galvanised Axle Plate to suit 50 mm axle (1 pair)
  • 60014 Spring Hanger Bolt M16 x 95 mm (1 pair)
  • 60015 Spring Hanger Nut M16 Nyloc (1 pair)
  • 60013 Spring Hanger 16 mm Eye, suits 50 mm Spring (1 pair)
  • 60012 Spring Slipper, suits 50 mm Spring (1 pair)

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 

Specifications

Brand: Treadway
Load Rating: 1250kg
Type/Finish: Zinctech
Width: 50mm

Questions?

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