50mm Square Heavy Duty U-Bolt Kit

50mm Square Heavy Duty U-Bolt Kit


Strong, High-TensileCouplemate Electrogal Logo
Recommended for Heavy Trailers
Perfect for Off-Road and Rocker Roller Springs

Product by Couplemate™ Australia.

Couplemate accepts PayPal, Visa and Mastercard.

50mm Heavy Duty ElectroGal U-Bolt Kits

50mm heavy-duty U-bolt kits are designed to secure 50mm axles to 60mm spring suspension used on tandem trailers.

Product Specifications

  • U-Bolt Thickness: 16mm (M16)
  • Leg Length: 180mm
  • Thread Length: 50mm
  • Coating: ElectroGal

Specifically designed to handle 3000kg and over.

This kit is supplied with:

  • 4 x U-Bolts
  • 8 x Washers
  • 8 x Nyloc nuts
  • 2 x Fish Plates
  • 2 x Axle Pads/Spacers


U-Bolt Calculator

Not sure how long your U-Bolt needs to be? Use the Couplemate™ U-Bolt Calculator to get a quick, accurate answer.

All measurements are in millimetres (mm).

Calculate Total


What is ElectroGal?

ElectroGal is electrolysis that applies a dual coating to steel components. Electrolysis is a reaction to electrically charged particles passing from a base metal through conductive water to the u bolts or other parts that are in solution.

After cleansing, u-bolts are coated with 2 solutions to coat the before the final coating of nickel is applied.

Tightening U-Bolts

Torque Setting: 100Nm

Couplemate recommends tightening nylons with a socket. Critical: Tighten nuts on the diagonals.

Q. Can I use a Rattle Gun to tighten U-Bolts?

Generally speaking, we recommend against it.

Rattle guns used on tightening U-Bolts tighten too fast and can cause the nylon inside the nyloc to overheat and become loose. Rattle guns cause one side of the fish plate to become too tight, causing spring breakages at the centre bolt.

test heavy duty 16mm u-bolt kit

Are Heavy-Duty U-Bolts worth it?

Within the industry, Trailer U-Bolts lack a standardised testing procedure.

However, Couplemate™ Engineers have developed its own rigorous testing method. In this process, we subject u-bolts, nuts, and fish plates to a static load test until destruction occurs.

All of our 16mm Heavy Duty U-bolt Galvanised Kit undergo a 200-tonne test. During this testing, the u-bolts in the right-hand image ultimately broke at the 23t threshold.

The u-bolts in the right-hand image broke at 23t.

Not convinced? Read why U-Bolts could be the primary cause of highway accidents.

Related Towing Products

AL-KO Rocker Roller Springsalko rocker roller springs

Maximum Capacity: 2500kg (per side)
Great for: Off-Road, Family Caravans

Designed for long-lasting performance, perfectly suited for caravans, horse floats, livestock, and other trailers that demand a smoother ride compared to standard suspension systems.

Whether you're traversing rough terrains or encountering challenging road conditions, these springs are engineered to provide superior resilience and unfaltering support throughout the journey.

AL-KO Outback Off-Road Springs9 leaf outback spring

Maximum Capacity: 4500kg
Great for: Off-Road Campers, Caravans

For outdoor enthusiasts and adventure seekers, the AL-KO Outback spring is a must-visit product.

It will easily conquer uncharted territories and thrilling off-road experiences, perfect for those craving a taste of exploration and adventure.

Additional information

Weight5 kg
Dimensions20 × 10 × 5 cm


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