Trailer Galvanised 40mm Square U-Bolts Kit with Axle Pads & Fish Plates – ARK Heavy Duty (SKU: JIA012)

The ARK Galvanised 40mm Square U-Bolt Set (SKU: JIA012) is the complete solution for securely mounting trailer axles. Designed for 40mm square axles, this heavy-duty set includes 4 galvanised U-bolts, 2 axle pads, and 2 fish plates — providing a reliable and rust-resistant installation system for trailers, caravans, or utility rigs.

Why Choose This U-Bolt Set?

• Full Kit: Comes complete with 4 x U-bolts, 2 x axle pads, and 2 x fish plates — everything you need for axle installation.
• Heavy-Duty Galvanised Finish: Provides long-lasting protection against rust and corrosion, ideal for all weather use.
• Perfect for 40mm Axles: Designed to suit trailers with 40mm square axles, ensuring a snug and secure fit.
• High Compatibility: Widely compatible with standard trailer suspension systems in Australia.

Key Specifications:

• U-Bolts: 40mm square | 130mm arm length | 60mm thread length | ½” diameter | Galvanised finish | Includes Nyloc nuts
• Axle Pads: 40mm wide | 40mm long | 7mm thick | 16mm centre hole | Galvanised finish
• Fish Plates: 90mm long | 95mm wide | 7mm thick | 16mm centre hole | 20mm bolt hole | 39x45mm hole spacing | Galvanised finish

This U-bolt kit is a must-have for anyone setting up or upgrading their trailer suspension system. Built to handle the harsh Aussie road conditions, from corrugated outback trails to coastal salt spray environments, this set delivers strength, durability, and peace of mind.

Whether you’re rebuilding a trailer from scratch or just reinforcing your suspension — this ARK U-bolt set gets the job done right, the first time.

Frequently Asked Questions

Evaluation & Recommendation

Who is this U-bolt kit ideal for?

• ✔️ Trailer owners building or upgrading suspension systems for 40mm square axles.
• ✔️ Campers and tradies needing reliable hardware for harsh off-road or coastal towing.
• ✔️ DIYers or workshop users looking for a complete, corrosion-resistant bolt-on solution.

If you’re not sure about sizing or compatibility with your axle setup, feel free to contact us — we’re happy to help you double-check.

Installation Tips:

1. Align your axle and spring assembly on the trailer chassis.
2. Place the axle pads on top of the spring to centre the axle.
3. Slide the fish plates under the axle and match the bolt holes.
4. Insert the U-bolts over the axle and through the fish plate holes.
5. Tighten the Nyloc nuts evenly on both sides — torque to spec and recheck after your first trip.