KATUNA U-bolt Kit for 2-3/8" Trailer Axles — 5-1/2" Long 1/2" Dia, 4-Pack, Corrosion-Resistant

KATUNA U-bolt kit is a four-piece heavy-duty fastening set designed to securely clamp 2-3/8" round trailer axles and 1.75" springs on trailers rated up to 3,500 lbs.

This complete replacement kit includes four 5-1/2" long, 1/2" diameter U-bolts plus nuts, flat and split lock washers, and two tie plates sized for 1-3/4" leaf springs. Each steel component is finished with a protective coating to resist corrosion and extend service life on road or in storage, making it a practical maintenance item for trailers, campers, small utility rigs, and work trailers.

How does this kit fit a 2-3/8" axle and 1.75" springs?

The U-bolts are shaped and spaced to wrap around a 2-3/8" round axle while clamping the spring pack beneath the axle beam. The included tie plates align with standard 1-3/4" leaf spring widths to distribute clamping force evenly.

• U-bolt inside diameter sized for 2-3/8" round axle beams.
• Tie plates match 1-3/4" spring seat width.
• Nuts and washers included to recreate factory-style clamps.
• Four U-bolts in kit for a typical single-axle trailer or two-axle repair pairs.

What materials and coatings protect the parts from rust?

Each U-bolt, nut, washer and tie plate is made from high-strength steel and finished with a corrosion-resistant coating. This finish reduces surface oxidation and helps the hardware last longer in outdoor and coastal conditions.

• High-strength carbon steel construction for load-bearing reliability.
• Protective surface coating for improved rust resistance.
• Anti-rust lubricant applied during packaging—may leave light oil residue.
• Washers and split-lock washers for secure retention under vibration.

Is installation difficult and what tools are needed?

Installation is straightforward and requires common hand tools; no specialty equipment is necessary. The kit replaces worn or broken U-bolts by sliding around the axle and tightening the included nuts against the tie plate and washers until snug.

• Standard 1/2" socket or wrench fits the included 1/2"-20 nuts.
• No press or hydraulic tools required for normal replacement jobs.
• Torque to manufacturer or service manual specifications for safe clamping.
• Quick swap-out process—typical DIY job for home garages.

Will this kit handle everyday trailer loads and road vibration?

These U-bolts are manufactured to support trailer axle assemblies rated up to approximately 3,500 lbs when installed correctly. The combination of sturdy bolts, lock washers and tie plates helps maintain clamping force under road shock and repeated load cycles.

• Rated for typical single-axle trailers and light-duty utility use.
• Split lock washers reduce nut loosening from vibration.
• Even clamping reduces spring movement and axle shifting.
• Periodic inspection advised for heavy or commercial use.

Who is this for: KATUNA's U-bolt kit is aimed at trailer owners, DIY mechanics, fleet maintenance crews, and campers needing a reliable, affordable replacement set for 2-3/8" axles and 1.75" springs. It suits routine trailer upkeep, end-of-season refreshes, and emergency roadside fixes where factory-style clamping hardware is required. If you maintain single-axle or light twin-axle trailers and prefer complete hardware sets with protective finishes, this kit offers a practical, ready-to-install solution.