3t Hydraulic Disc Braked Axle


Couplemate™ Custom Work Axles are made to your exact needs.Australian Made and Owned.

 Made in Australia.
 ADR Compliant & Approved.
 Solid steel for longevity and strength.

SKU: 50S3TH Category:
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3t Hydraulic Disc Braked Axle

3t hydraulic disc braked axle kit utilises a 50mm square galvanised to form the basis of the boat trailer setup.

The 50mm square hydraulic braked axle kit is a robust choice, and when you use it in tandem, extend the rating to 4.5t.

Couplemate manufactures 3t disc rotors that can be assembled on 50mm square or 60mm round galvanised axles. We recommend choosing these larger disc rotors. to maximise the length of service in between maintenance periods.

Important: Axle pads locate and centre the axle of the trailer springs. Please advise the outside chassis width of your trailer. We are then able to weld axle pads into the correct position. This service is not included in the price as some customers do not require this service.

Note: Rate 6t axles to 4.5t provides a more robust rig.

The axle kit consists of the following:

Galvanised axle kits have almost zero chance of rusting.

Purchase galvanised Rocker Rollers here.

Calculating the face-to-face measurement on your axle is important to know whether this would be the right fit. Here’s how you can do it:

  1. Measure the whole wheel offset, that distance between the inside of the hub inside the rim and outside of the rubber
  2. Measure the distance between the chassis and rubber or add 25 mm
  3. Add the chassis width by multiplying the number by 2

Technical Specifications

  • Weight –  120 kg.
  • Dimensions – 200 x 30 x 30 cm.

Visit our website for other types of marine braked axle kits like 45 mm square mechanical override disc brake axle kit, hydraulic disc brake axle kit – 45mm square, and even Landcruiser hydraulic disc brake axle kits. At Couplemate, we also offer U-bolt kits, tow hitch, and caravan trailer locks, to name only a few.

Calculating The Correct Axle Measurements

  1. Measure the offset wheel. The wheel offset is the distance between the hub’s inside and the rubber’s outside.
  2. Add 50 mm to the offset. Alternatively, choose your own distance between the rubber and the chassis.
  3. Multiply by 2 for both sides. Add your chassis width to the above number.

Metric to Imperial Converter

Convert Imperial (inches) to metric (mm)

  • =

Still unsure of what measurements to take? Check out this handy guide below:

[P] – Check material specifications. What size and profile is the axle (for example, 45mm Square)
[T] – Overall axle length (tip to tip)
[F] – Hub face-to-hub face measurement
[A] – Chassis width
[C] – Tyre clearance
[B] – Back offset
[H] – Tyre to chassis
[G] – Axle pad centres

How To Measure An Axle

Identifying Bearing Combinations

You will also need to identify your bearing combination, which can be done by pulling off a hub and bearings and locating the number laser engraved onto the bearing. You will require both the inner and the outer bearing number.

Where to identify bearing number. Look for the laser engraved number on the bearing.

Additional information

Weight90 kg
Dimensions240 × 60 × 60 cm
Stud Pattern

6 Stud Landcruiser – 1/2-inch Studs, 5 Stud Landcruiser – 9/16-inch Standard Studs, 5 Stud Landcruiser – 14mm Studs


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