ARK Trailer Axle Fish Plate 60mm Spring 50mm Wide 10mm Thick 110x100mm (SKU: FP4550)

The ARK Trailer Axle Fish Plate FP4550 is built tough to handle the demands of heavy-duty trailer suspension systems. Designed to secure 60mm wide leaf springs and suit U-bolts ranging from 45mm to 50mm, this plate ensures stability and safety when towing on and off-road.

With a robust 10mm thickness and precision-drilled bore diameters, the FP4550 is made for reliable clamping without deformation. The U-bolt holes are spaced 45mm x 60mm apart with a 20mm diameter, while the centre bore measures 18mm – perfect for accommodating locating pins or centre bolts on your spring packs.

Constructed with a 110mm x 100mm square profile and finished in corrosion-resistant black coating, this plate offers both durability and clean aesthetics. Whether you’re building a new trailer, replacing worn-out hardware, or upgrading your suspension system, this fish plate is a key component for safe, long-lasting performance.

Key Features:

• Heavy-duty steel construction – 10mm thick
• Suits 60mm wide leaf springs
• Compatible with 45–50mm U-bolts
• Dimensions: 110mm x 100mm
• 20mm U-bolt hole diameter
• 18mm centre bore – ideal for spring pack alignment
• Black protective finish

Ideal for trailers, campers, off-road rigs, or any application requiring a secure, tough axle mounting solution.

Frequently Asked Questions

Evaluation & Recommendations

This fish plate is best suited for:

• Trailer and caravan owners replacing worn-out suspension parts
• Builders upgrading or assembling off-road trailers with 60mm leaf springs
• Repair shops seeking reliable components for axle and spring alignment

Installation Tips:

1. Position the fish plate on top of or beneath the axle, depending on your setup
2. Insert U-bolts through the aligned holes and tighten gradually in a crisscross pattern
3. Ensure the spring centre bolt aligns with the 18mm centre bore
4. Re-check all torque after the first few trips

If you’re using non-standard spring sizes or custom axle setups, contact us for tailored advice and compatibility checks.