CENTERBOLT: 3/8″ x 3″ LONG

Description

Centerbolt for Leaf Spring, 3/8″ x 3″ with nut

A leaf spring center bolt is a specialized fastener used to hold the individual leaves of a leaf-spring pack together. Typically, it is a threaded bolt with a cylindrical head that sits in the locating hole on the spring perch/ spring seat or tie plate. This ensures that the axle stays centered and squarely under the trailer. It plays a critical role in keeping the spring leaves together and aligned. Typical symptoms of a broken center bolt are when the individual leaves are not square with the pack and have slid sideways, premature tire wear, or misalignment of the axle. These bolts are available in various lengths and diameters to accommodate different spring pack thicknesses and spring types. Made from high-strength steel and threaded for a secure nut fastening, our trailer spring center bolts are designed to handle the road’s bumps, vibrations, and load stress without bending or breaking. Whether you’re rebuilding an original spring pack or replacing a broken bolt, John’s Spring and Suspension carries the quality parts you need to keep you on the road mile after mile.

What Is a Leaf Spring Center Bolt?

A leaf spring center bolt is a critical fastener that secures and aligns the individual leaves within a suspension pack. The CENTERBOLT: 3/8″ x 3″ LONG is designed to maintain proper axle positioning, prevent shifting, and ensure consistent performance under heavy loads and road vibrations.

When to Replace Your Center Bolt

A worn or damaged center bolt can compromise your entire suspension system, leading to alignment issues and unsafe driving conditions. Recognizing the early signs of failure helps prevent costly repairs and keeps your trailer or truck operating safely.

• Leaf spring pack appears shifted or misaligned
• Uneven or premature tire wear develops
• Clunking noises from the suspension under load
• Visible rust, bending, or bolt damage
• Axle no longer sits centered on the spring seat

Our team is here to help you find the right replacement and keep your suspension performing at its best.

Installation Recommendations for 3/8″” Center Bolts 

• Safely lift and support the vehicle
  Use proper jack stands before working on the suspension.
• Remove U-bolts and relieve pressure
  Take off the tie plate to release tension on the spring pack.
• Clamp the leaf springs together
  Prevent the leaves from separating during removal.
• Replace the center bolt
  Insert and tighten the new 3/8″ center bolt securely.
• Reassemble and align properly
  Ensure the bolt seats correctly in the spring perch.
• Tighten all components evenly
  Secure hardware to maintain alignment and stability.

Our team can help you get the right fit and ensure everything is installed correctly.