Axles & Suspension Spring Sets Tri-Axle Kits

Spring Set Tri-Axle 3500kg Zinctech Inc ubolts & plates to suit 50mm axle

NZ $1,555.90 excl GST
SKU: 63050
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Description

This tri-axle suspension kit is designed for trailers with a total GVM of up to 3,500 kg using 50 mm axles. It includes six progressive, anti-rattle trailer springs, as well as U-bolts, axle plates, tandem rocker arms, and all essential mounting hardware. Built to reduce noise and wear while improving ride comfort and load response, this complete kit suits new trailer builds or full suspension upgrades.

Key Features

  • 6-leaf Zinctech-coated springs rated at 1,500 kg per axle pair
  • Progressive spring compression adapts to load changes for smoother towing
  • Anti-rattle design minimises vibration and noise
  • Longer second leaf reinforces spring eye for added durability
  • 50 mm wide x 6 mm thick leaves for robust load support
  • Pre-installed durable nylon bushes
  • Complete hardware kit for easier installation
  • U-bolts and axle plates included to suit 50 mm axle setups

Applications

  • Tri-axle utility trailers
  • Equipment transport trailers
  • Car haulers and flatbeds
  • Agricultural supply trailers
  • Marine and boat trailers
  • Enclosed trailers with higher payloads

Specifications

  • Trailer Spring Type: Eye/Slipper
  • Spring Capacity: 1,500 kg per axle (pair)
  • Leaf Count: 6
  • Leaf Width: 50 mm
  • Leaf Thickness: 6 mm
  • Spring finish: Zinctech anti-corrosion coating
  • Axle Suitability: 50 mm square axle

Kit Inclusions

  • 60004 Springs Only 1,500 kg Zinctech 6 Leaf (3 pairs)
  • 60016 Galvanised Axle Plate to suit 50 mm Axle (6 pieces)
  • 60024 Galvanised U-Bolt 133L x 51W M12 suits 50 mm Box (12 pieces)
  • 60007 Tandem Rocker Arm Hanger (4 pieces)
  • 60006 Tandem Rocker Arm Eye/Slipper Type (4 pieces)
  • 60008 Tandem Rocker Arm Centre Bolt M20 x 195 mm (4 pieces)
  • 60009 Tandem Rocker Arm Centre Nut M20 Nyloc (4 pieces)
  • 60014 Spring Hanger Bolt M16 x 95 mm (6 pieces)
  • 60015 Spring Hanger Nut M16 Nyloc (6 pieces)
  • 60010 Tandem Rocker Arm Slipper Bolt M10 (4 pieces)
  • 60011 Tandem Rocker Arm Slipper Nut M10 Nyloc (4 pieces)
  • 60013 Spring Hanger 16 mm Eye, Suits 50 mm Spring (2 pieces)
  • 60012 Spring Slipper, Suits 50 mm Spring (2 pieces)

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
Fixing: U-bolt (50mm)
Load Rating: 3500kg
Type/Finish: Zinctech
Width: 50mm

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