45mm Square Mechanical ElectroGal Disc Brake 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.

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45mm Square Mechanical Disc Brake Axle | ElectroGal | Australian-Made

45mm Square Mechanical ElectroGal disc brakes on a galvanised axle.

ElectroGal disc rotors are the latest product released by Couplemate. The cross-drilled disc rotors remove gases and debris from the disc face, improving performance. Australian Made and Owned.

Superior braking is achievable by drilling holes through the disc. This will give moisture, gas, and particles somewhere to escape. The ‘scraping’ action of the slots can clean the pad, and the edges of the groves increase friction, albeit at the expense of pad wear.

Disc Brake Wheel Options

  • Holden HT
  • Ford

Do cross-drilled disc rotors fit standard disc setups?Electrogal Disc Rotor

Yes, ElectroGal rotors by Couplemate fit all standard SL and LM mechanical and hydraulic caliper setups. When ordering, we need to know whether you wish for a left-hand or right-hand side rotor.

Bearing Sizes

  • Slimline Bearing Configuration LM12749/LM68149
  • Parallel Bearing Configuration LM68149/LM68149

Couplemate manufacturers and tests all square mechanical disc brake override axles.

Kit includes

Important: Axle pads locate and centre the axle of the trailer springs. Please advise us on 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.

Mechanical Override Disc Brakes are simple brakes to understand and maintain. Ensure brake caliper adjustments are made on the caliper bolt and not the cable adjuster.

Couplemate installs the best Al-ko calipers on all of our mechanical braking systems.

The force exerted during braking from the tow vehicle engages the override brake, which activates the mechanical calipers causing braking.

Please note: We ask you for your face-to-face measurement of your axle.

The latest news on small axles is that they are causing trailer and caravan axle fatigue.

Calculating The Correct Axle Measurements

As a result of viewing the video above, calculate the face-to-face measurement.
  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 the distance between the rubber and the chassis.
  3. Multiply by 2 for both sides. Add your chassis width to the above number.
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 numbers.

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



Did you know that the bolts holding in your caliper can unwind on rough, corrugated roads?

Couplemate uses a medium-strength locktite on all mechanical caliper bolts.

Additional information

Weight70 kg
Dimensions240 × 50 × 50 cm
Stud Pattern



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