News Bulletin

Worn or stretched U-bolts are one of the most overlooked but critical safety items on any trailer. When U-bolts loosen or fail, leaf springs shift, alignment suffers, and the entire suspension system becomes unstable — creating dangerous handling issues while towing.

The Problem with Worn U-Bolts

Constant vibration, road shock, and heavy loads gradually stretch or corrode U-bolts. This leads to loose springs, uneven tire wear, poor tracking, and in extreme cases, complete suspension failure. Many trailer owners only notice the problem after hearing clunking noises or experiencing swaying on the highway.

Why Quality U-Bolt Kits Matter

Southwest Wheel U-Bolt Kits provide the strength and precision needed to restore your trailer’s suspension to peak performance. Made with high-grade materials and designed for specific axle tube sizes, these kits deliver the clamping force required to keep leaf springs securely mounted under heavy loads.

Featured U-Bolt Kits from Southwest Wheel

Over/Under Conversion Kits

Popular K71-384-00 (2-3/8" tube) and K71-385-00 (3" tube) allow you to convert between over-the-axle and under-the-axle spring configurations. Each kit includes U-bolts, plates, nuts, and all necessary hardware for a complete upgrade.

Standard U-Bolt Replacement Kits

Available in multiple diameters and lengths to match common trailer axles (3,500 lb to 10,000 lb+ capacities). Kits include properly sized U-bolts, heavy-duty tie plates, and corrosion-resistant nuts for a factory-like fit.

Key Benefits of Southwest Wheel U-Bolt Kits

Superior Strength: Manufactured from high-tensile steel for maximum clamping force and durability.
Corrosion Resistance: Many kits feature zinc or protective coatings to withstand road salt, moisture, and harsh conditions.
Exact Fit: Designed as direct replacements or upgrades for Dexter, Lippert, and other popular axle brands.
Complete Kits: Everything needed in one package — no guessing or extra trips to the hardware store.
Made in USA Quality: Many options proudly carry the “Made in USA” mark for premium performance.

Popular Applications

These U-Bolt Kits are ideal for:

Utility and equipment trailers
Boat and RV trailers
Agricultural and livestock haulers
Heavy-duty construction trailers
Fleet maintenance programs

Whether you’re performing routine maintenance or converting spring configuration for better ride height or clearance, Southwest Wheel has the right U-Bolt Kit for your setup.

Installation Tips for Best Results

Always torque U-bolts in a criss-cross pattern to manufacturer specifications.
Re-check torque after the first 50-100 miles of use.
Inspect leaf springs and hangers while the suspension is apart.
Use anti-seize on threads in corrosive environments.

Verify fitment before ordering or contact Southwest Wheel for assistance.

Why Choose Southwest Wheel for Suspension Parts

Southwest Wheel has been a trusted name in the truck and trailer parts industry for over 100 years. We carry a full selection of U-Bolt Kits, leaf springs, hangers, shackles, and complete suspension components from trusted brands like Lippert and Dexter. Our knowledgeable staff helps customers match the correct hardware to their specific axle and spring setup.