Secure deep frames, multi-leaf springs, and heavy-duty brackets to 3-inch trailer tubing with an extended-length, rust-resistant square bend U-bolt.

Take control of your heavy-duty marine towing setups with this premium Galvanized Square U-Bolt. Featuring an extra-long 5-5/16" inside length paired with a 3-1/16" opening, this high-tensile fastener is specifically engineered to wrap perfectly around standard 3-inch wide square steel frames while leaving plenty of thread clearance. It is the ultimate choice for mounting thick crossmembers, stacked leaf-spring suspensions, multi-tier bunk brackets, and heavy tongue accessories. Hot-dip galvanized for extreme marine protection, it is built to survive continuous saltwater immersion and rugged road environments without corroding.

Key Features

• Extended 5-5/16" Inside Length: Provides maximum vertical clearance, making it perfect for thick frame attachments, backing plates, and stacked suspension setups.

• Precision 3-1/16" Inside Width: Fits snugly and securely over standard 3" square or rectangular steel tubing, preventing shifting and rattling under heavy highway loads.

• Hot-Dip Galvanized Armour: Coated in a thick, molecularly bonded zinc layer for superior rust and corrosion defense in punishing marine and freshwater environments.

• High-Torque 1/2"-13 Threads: Deeply cut, standard 1/2" coarse threads allow for maximum clamping force and uniform pressure without stripping out.

Technical Specifications