Axles & Suspension Trailer Spring Kits & Suspension Components Tri-Axle Trailer Spring Kits

Spring Set Tri-Axle 3500kg Zinctech Inc ubolts & plates to suit 65mm axle

NZ $1,717.92 excl GST
SKU: 63051
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Description

This tri-axle trailer spring set is engineered for consistent, heavy-duty performance in demanding towing applications. Designed to suit 65 mm axles and rated at 3,500 kg GVM, it features 6-leaf Zinctech-coated springs with progressive compression and anti-rattle design. Each component in the kit is selected for durability, reliability, and smooth trailer handling—even under shifting loads.

Key Features

  • Progressive spring compression adapts to light and heavy loads
  • Anti-rattle spring and slipper design reduces vibration and noise
  • 6-leaf springs with extended second leaf for added strength
  • 50 mm wide x 6 mm thick leaves for durability
  • Zinctech coating for corrosion resistance
  • Pre-installed nylon bushes for easy setup
  • Compatible with 65 mm axle assemblies
  • Complete mounting hardware included

Applications

  • Tri-axle flat deck trailers
  • Agricultural or rural transport trailers
  • Industrial equipment trailers
  • Car carriers and enclosed trailers

Specifications

  • Load Capacity: 1,500 kg per axle (pair)
  • Trailer Spring Type: 6-leaf, eye/slipper type
  • Spring Width: 50 mm
  • Leaf Thickness: 6 mm
  • Axle Compatibility: 65 mm
  • Spring finish: Zinctech-coated

Kit Inclusions

  • 60017 Galvanised Axle Plate to suit 65mm Axle (6 pieces)
  • 60019 Galvanised U-Bolt 145L x 68W M12 suits 65mm Box (12 pieces)
  • 60004 Springs Only 1,500 kg Zinctech 6 Leaf (3 pairs)
  • 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?

A: 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-bolts (65mm)
Load Rating: 3500kg
Type/Finish: Zinctech
Width: 50mm

Questions?

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