2x TROJAN Trailer U BOLT M12 Round 51x120mm Galvanised U-Bolts Nuts Washer SB (SKU: 271035)
$24.20
Heavy-duty M12 galvanised round U-bolts designed for securely mounting 50mm round axles to trailers. Corrosion-resistant and includes nuts and washers.
In stock
Product Overview:
These 2x TROJAN M12 Round Trailer U-Bolts are purpose-built for mounting 50mm round axles onto trailer chassis. With a durable galvanised finish and robust M12 thread, these U-bolts offer strong, rust-resistant performance perfect for all types of trailers, including boat trailers, caravans, and utility trailers.
Key Specifications:
- 51mm internal width – perfect for 50mm round axles
- 120mm arm length – offers deep secure grip around axle tubes
- 45mm thread length – provides firm clamping with room for suspension brackets
- 12mm diameter (M12) – heavy-duty strength and stability
- Galvanised finish – protects against corrosion and harsh weather
- Includes matching nuts and washers – ensures easy installation
Applications:
- Mounting 50mm round axles to trailer frames
- Securing suspension systems, brackets, and hangers
- Boat trailers, box trailers, campers, and utility trailers
Built to withstand the roughest roads and wettest weather, these U-bolts deliver reliable performance where it matters most. The galvanised steel body prevents rust, while the M12 diameter provides a secure hold even under heavy towing loads.
Related
Frequently Asked Questions
Q: Is this U-bolt suitable for 50mm round axles?
A: Yes, it is specifically designed to clamp around 50mm round axles with a 51mm internal width.
Q: Does it include nuts and washers?
A: Absolutely. Each pair comes complete with nuts and washers for installation.
Q: Will the galvanised coating resist rust?
A: Yes, the galvanised finish is ideal for outdoor and marine environments.
Q: Can I use this for a boat trailer?
A: Yes, it’s a great choice for boat trailers due to its corrosion resistance and strength.
Evaluation & Recommendations
This U-bolt set is best suited for those who need to mount or replace axle fittings on trailers with 50mm round axles. It is ideal for:
- Boat and marine trailer users requiring rust-resistant fasteners
- DIY trailer builders and repairers
- Caravan and camper owners maintaining their suspension system
If your axle is square or larger than 50mm, please contact us for the correct fitting.
Installation Guide:
- Position U-bolt around the axle and through your mounting plate
- Secure nuts and washers on both ends
- Evenly tighten both sides to ensure proper clamping
- Recheck after first use to confirm the tension holds under load

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