We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Stub Axle?

By Lori Kilchermann
Updated May 23, 2024
Our promise to you
WikiMotors is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WikiMotors, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A stub axle is an axle that is connected to an assembly that mounts on one side of a trailer. It does not go all the way across the trailer like a typical straight axle does. The stub axle typically is part of an assembly that includes the spring and shock mounts and is connected so that it can move freely as an integral part of the trailer's suspension.

By using a stub axle assembly on a trailer, it is able to traverse rough roads without disturbing its load. The axle works much like an independent suspension on a sports car and allows each tire and wheel assembly to move independently. This drastically improves cornering as well as braking characteristics, especially on slippery roads.

Most units are cast into the axle assembly and the entire piece is one single part, although others are independent assemblies that fit into a receptacle on the trailer and are a separate component. In either case, the axle typically has a single wheel and tire bolted to it. Occasionally, this axle can be used in a dual-wheel application as well.

The stub axle, in most cases, is easily replaced if broken. Most axles are bolted into a mounting assembly and can be simply removed by loosening a few bolts and sliding the broken stub out of the housing. In the cast units, the entire unit with stub must be replaced. This typically requires the removal of the springs and shocks as well.

While some axle failures can be welded, this is not advised in most cases. The stress and leverage on a stub axle is so great that many welded ones can break during a typical turn. As the trailer is turned, the axle has to slide the tire throughout the entire turn. This causes the repaired stub to strain and pull against the weld. In most cases, failure will occur with the axle breaking off at the weld.

In the case of a single cast piece, the cast iron is not a good candidate for welding either, and this type of repair should never be attempted. The porous nature of the cast iron creates many weak spots in a weld area. Catastrophic failure is sure to arise from any attempted welding. If in doubt of which type of axle assembly is in place, contact the trailer manufacturer or read the owner's manual.

WikiMotors is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.

WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.