Axles & Suspension Spring Sets Tandem Axle Kits

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

NZ $925.80 excl GST
SKU: 62054
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Description

Engineered for serious load-carrying applications, this trailer spring set delivers exceptional suspension performance for tandem axle trailers up to 3,500 kg GVM. This heavy-duty set includes robust 8-leaf springs with a Zinctech protective coating to combat rust and corrosion. The extended second leaf improves structural support while the anti-rattle spring design ensures smoother, quieter operation over rough surfaces.

With pre-installed nylon bushes and precision-fit anti-rattle slippers, this setup is built for durability and ease of use. It comes complete with U-bolts, axle plates, rocker arms, hangers, and all essential hardware for straightforward installation on 50 mm axle tandem trailers.

Key Features

  • 8-leaf Zinctech-coated springs with 6 mm thick leaves provide strong, stable support
  • Progressive spring compression improves load control and ride comfort under variable weight conditions
  • Anti-rattle spring design reduces noise and movement between spring leaves
  • Extended second leaf wraps around the eye for increased spring strength and durability
  • Anti-rattle slippers fit snugly to reduce wear and noise
  • Easy-align hangers, anti-slip bolt lugs and pre-installed nylon bushes for faster, hassle-free rocker installation
  • All required U-bolts, axle plates, and essential mounting hardware included

Applications

  • Heavy-duty tandem axle trailers up to 3,500 kg
  • Machinery, equipment, and construction trailers
  • Car transporters and tilt-bed trailers
  • Agricultural, forestry, or livestock transport trailers
  • Coastal and off-road trailers needing high durability and rust resistance

Specifications

  • Spring rating: 1,750 kg per pair (3,500 kg total for tandem setup)
  • Trailer spring type: Eye-to-slipper
  • Number of leaves per spring: 8
  • Spring width: 50 mm
  • Leaf thickness: 6 mm
  • Spring finish: Zinctech protective coating
  • Axle compatibility: 50 mm square axle

Kit Inclusions

  • 60005 Springs Only 1,750 kg Zinctech 8 Leaf (2 pairs)
  • 60024 Galvanised U-Bolt 133L x 51W M12 Suits 50mm Box (8 pieces)
  • 60016 Galvanised Axle Plate to suit 50mm Axle (4 pieces)
  • 60007 Tandem Rocker Arm Hanger (2 pieces)
  • 60006 Tandem Rocker Arm Eye/Slipper Type (2 pieces)
  • 60014 Spring Hanger Bolt M16 x 95 mm (4 pieces)
  • 60008 Tandem Rocker Arm Centre Bolt M20 x 195 mm (2 pieces)
  • 60009 Tandem Rocker Arm Centre Nut M20 Nyloc (2 pieces)
  • 60015 Spring Hanger Nut M16 Nyloc (4 pieces)
  • 60010 Tandem Rocker Arm Slipper Bolt M10 (2 pieces)
  • 60011 Tandem Rocker Arm Slipper Nut M10 Nyloc (2 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-bolts (50mm)
Load Rating: 3500kg
Type/Finish: Zinctech
Width: 50mm

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