Description

This 1,500 kg-rated gull wing axle is built for hydraulic disc brake systems and comes pre-fitted with cast iron hubs and calipers. The hot dip galvanised axle beam has a (5mm wall) hollow construction that offers the strength of a solid axle with reduced weight. At the hub, precision-machined stub axles ensure a tight fit to the calipers, while high-quality Japanese NSK bearings and a Geomet-coated cast iron rotor deliver smooth, consistent braking performance.

Need a custom axle? Use our online axle builder to get a quote. Or let us know your axle dimensions when ordering by email or phone.

Key Features

  • 1,500 kg load rating – ideal for medium-duty trailers
  • Hot dip galvanised axle beam – corrosion-resistant finish
  • Cast iron disc rotors with Geomet coating – enhanced durability
  • Stub axles machined for a tight caliper fit
  • NSK Japanese tapered roller bearings – high quality and long-lasting
  • Marine-grade oil seal with stainless steel back plate
  • 5x114.3 mm (5x4.5") PCD – suits a wide range of trailer wheels

Applications

  • Boat trailers
  • Custom builds and replacement axles for trailers up to 1,500 kg

Specifications

  • Axle type: Gull wing
  • Axle rating: 1,500 kg
  • Axle length: 2 metres (can be customised)
  • Axle finish: Hot dip galvanised
  • Hub type: Hydraulic disc, cast iron
  • Rotor: Cast iron with Geomet coating
  • Bearings: NSK tapered roller
  • PCD: 5x114.3 mm (5x4.5")
  • Stub axle: Precision-machined
  • Oil seal: Stainless steel-backed marine-grade seal

Inclusions

  • 98036 – Box section 50x50 mm, 5 mm thickness, 2 m length, bare steel
  • 65100 – Hub Set 1,500 kg 5x4.5" PCD Braked Hyd Disc Cast Iron – Pair
  • 65200 – Brake Calipers Cast Iron (pr) suits 1,500/1,750/2,000 kg Hub Set

FAQs

Q: What are Japanese NSK bearings?

A: NSK is a world-leading Japanese bearing manufacturer. Their tapered roller bearings are highly regarded for strength, smooth performance, and long service life, offering a clear advantage over generic alternatives.

Q: What braking system is needed to operate the hydraulic disc brakes?

A: This set can be used with a hydraulic override coupling fitted to the trailer drawbar. You may also opt to install an electric-over-hydraulic kit if you prefer to have more braking options, and if you want the ability to control the brake from inside the towing vehicle.

Our HydroBrake EOH actuator and controller kits are excellent options. Please visit this page to learn more:

https://www.treadway.co.nz/shop/brakes/hydraulic-brake-kits.html

Q: Does the axle include brake pads?

A: Yes. The cast iron calipers are supplied complete with brake pads fitted. Replacement pads are available separately.

Q: What are the advantages of using box section beams for axles?

A: Box section beams (hollow tube axles) offer significant weight savings without compromising strength for most applications. Their lighter construction allows for increased payload capacity, easier handling during installation, and faster fabrication turnaround. They also allow for easy customisation, making them a flexible choice for trailer builders.

Q: What is Geomet surface treatment?

A: Geomet is a water-based zinc–aluminium flake coating, typically used in truck and car brakes. It provides long-lasting protection against rust and corrosion, is highly heat-resistant so it won’t burn off under braking, and is environmentally friendly as it contains no hexavalent chrome or heavy metals. It works through physical barrier protection, galvanic action (where zinc corrodes before steel), and passivation—forming a stable layer that slows further oxidation. This makes it ideal for trailer brake rotors, delivering durability, consistent performance, and reduced maintenance.

Q: What are the benefits of cast iron hubs?

A: Cast iron hubs are a popular choice for trailer braking systems due to their combination of strength, thermal performance, and cost-effectiveness. Here are the key benefits:

High Strength and Load Capacity: Cast iron has excellent compressive strength, making it well-suited for supporting heavy loads without deforming. This makes it ideal for medium- to heavy-duty trailers.

Superior Heat Dissipation: During braking, friction generates heat. Cast iron naturally dissipates heat efficiently, helping to maintain braking performance and reduce the risk of brake fade over time.

Durability and Wear Resistance: Cast iron is highly resistant to wear and abrasion, which contributes to a longer service life—especially important in braking components that experience repeated stress.

Stable Performance Under Load: Its rigidity and dimensional stability under high temperatures ensure consistent braking performance, even during prolonged use.

Specifications

Brand: Treadway
Load Rating: 1500kg
Type/Finish: Galvanised
PCD: 5x114.3

Questions?

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