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 from 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 Hub Flange?

By Lori Kilchermann
Updated May 17, 2024
Our promise to you
About Mechanics 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 About Mechanics, 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 hub flange is a device used to support a wheel, pulley or sprocket on a machine. Consisting of a flat, steel plate fitted with mounting studs around the perimeter, the hub flange provides a location for the pulley, wheel or gear to be mounted while also providing a bearing location to allow the flange to rotate smoothly. It is common for a hub flange to be used as a component in a bearing assembly, making changing a bad bearing a simple, one-step procedure.

The purpose of a hub flange is not only to house the mounting studs for the wheel, pulley or sprocket, but to also provide a flat and smooth surface that is machined perfectly plumb to provide a straight-running attachment that will track correctly. By creating the flange perfectly flat and plumb, the wheel or sprocket will not wobble or run off-center when mounted onto the hub assembly. This increases efficiency and adds greatly to the life expectancy of the bearing in the assembly. In the case of a belt or chain, these components also receive added life by running straight on the assembly and not experiencing premature wear by rubbing against the side of a wobbly assembly.

In order to create a hub flange that is part of a bearing assembly, the flange is often cast or machined as either the inner or outer bearing race, depending on the application. This type of manufacturing design, popular in both machine and automobile manufacturing and design, adds greatly to the total strength of the flange assembly and lowers the manufacturing cost of building the assembly. This cost savings can be passed onto the customer, making the design popular among discount auto supply stores as well as automobile and machinery manufacturers.

While some hub flange designs use a greaseable bearing hub, the vast majority do not. The sealed bearing used in the non-greaseable design allows the unit to operate for long periods with no maintenance needs. The downside of this type of assembly is that once a problem is detected with the unit, the entire assembly must be changed. With a greaseable unit, the bearing is lubricated before and during every work cycle. This not only provides the proper amount of lubrication to give the hub flange a long working life, it also forces the worker to look at the assembly and check it for issues at every start-up.

About Mechanics 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

About Mechanics, in your inbox

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

About Mechanics, in your inbox

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