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50mm Square Axle w/ Mechanical Disc – Galvanised

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50mm Square Axle w/ Mechanical Disc - Galvanised

50mm square mechanical disc brake is galvanised and activated when the tow vehicle engages the override brake.

Disc Options

  • Holden HT.
  • Holden HQ.
  • Ford.
  • 6 Stud Landcruiser.
  • 5 Stud Landcruiser.
  • 6 Stud Parallel Landcruiser.
  • 5 Stud Parallel Landcruiser

Bearing Sizes

  • LM12749
  • LM68149

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

Kit includes

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 in turn 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 causing trailer and caravan axle fatigue.


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.

50mm Square Mechanical Disc Brake Axle

Additional information

Weight90 kg
Dimensions40 × 40 × 240 cm
Stud Pattern

Ford – 5 x 114.3mm (1/2"), HT Holden – 5 x 107.95mm (7/16"), HQ Holden – 5 x 4.75" (7/16"), 6S Landcruiser – 6 x 139.7mm (1/2"), 5S Landcruiser – 5 x 150mm (9/16")


Slimline (1450kg) – 10" Disc, Parallel (1600kg) – 12" Disc