50mm Square Hydraulic Disc Brake Axle


50mm Square Hydraulic Disc Brake Axle


Couplemate - Engineered For Quality

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50mm Square Hydraulic Disc Brake Axle

50mm square hydraulic disc brake axle kits are for use on boat trailers due to their anti-corrosive characteristics.

The 50mm square hydraulic axle assembly is our most popular seller.

This axle group is rated

Boat trailers use hydraulic disc brakes due to the anti-corrosive characteristics of galvanised disc braking system.

  • All Couplemate marine disc braked axles are Australian-made and galvanised.
  • Did you know Couplemate have a lifetime warranty against faulty craftsmanship?
  • However, this warranty does not cover consumables such as bearings and disc pads.

This kit includes:

Couplemate has disc braked axles to suit the following wheel stud patterns

  • Ford SL
  • HT Holden SL
  • HQ Holden SL
  • Commodore SL
  • 5 Stud Landcruiser SL
  • 6 Stud Landcruiser SL

Purchase 2t American Stainless Rotor and Caliper setups here

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.

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 by removing the 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.

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