2x ARK Galvanised Square U Bolts 60x110mm Arm Length with 50mm Thread for Trailer & Caravan (SKU: MRUB3G)

ARK MRUB3G Galvanised U Bolts are long-arm, heavy-duty square U bolts built for securely fastening trailer axles, spring hangers, chassis plates, or any steel frame section. With a generous 110mm leg length and 50mm threaded section, they’re ideal for deeper components and thicker beams.

These U bolts have a 60mm internal width and are made from tough 1/2″ diameter steel, coated with a protective galvanised finish for rust resistance in harsh weather or marine environments. They are a perfect choice for high-vibration towing setups that need solid, long-term hold.

Specifications:

• Internal width: 60mm
• Arm length: 110mm
• Thread length: 50mm
• Thread diameter: 1/2″ (approx. 12.7mm)
• Shape: Square U bolt
• Finish: Hot-dip galvanised
• Quantity: 2 bolts per set

Whether you’re replacing worn-out clamps or installing a new axle bracket, these U bolts offer dependable performance and rust-proof durability.

FAQ

Q: What size beam or chassis does this fit?

A: It fits 60mm wide box sections or bracket plates. The 110mm length is suitable for deep mounting applications.

Q: Are nuts and washers included?

A: This listing includes only the U bolts. We recommend pairing with 1/2” UNF hardware.

Q: Is this suitable for saltwater or coastal use?

A: Yes! The galvanised finish helps prevent corrosion in marine or damp environments.

Q: Can I use this on a boat trailer?

A: Absolutely. It’s a great fit for boat trailers, utility trailers, and general trailer suspension systems.

Evaluation & Recommendation

The MRUB3G is a heavy-duty solution for deeper or thicker mounting requirements. If you need strong clamping power for longer brackets or to secure multiple layers—this U bolt is your go-to hardware.

Recommended for:

• Boat trailers and marine applications
• Heavy-duty spring bracket mounting
• Axle plate clamps for larger beams or double plates
• Steel frame constructions needing rust-resistant clamping

Installation Tips:

• Clean contact surfaces before clamping
• Use matching galvanised washers and nyloc nuts
• Apply torque evenly across both threads to avoid distortion

Need help choosing the right size? Contact us with your beam dimensions—we’ll help you find the best fit from our U bolt range.