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 Jaw Chuck?

By Emma G.
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 chuck is a round clamp used to hold a cylindrical object in place. They are often used to hold rotating tools like drill bits or to hold parts in place while they are being machined. A jaw chuck is a chuck with clamps or bolts arranged around the rim of the chuck. There are several types of jaw chucks, each used for a specialized purpose. These include self-centering chucks, drill chucks, and independent jaw chucks.

Many chucks come with removable jaws. The top part of each jaw can be removed by loosening screws to allow the operator to replace worn-out jaws. Standard hardened steel jaws can also be replaced by specialized jaws designed for a particular job or soft jaws made out of metal, plastic, or wood.

Jaw chucks are designed to be adjusted in one of two ways. A jaw chuck can be adjusted by hand using a rotational motion, like that used on many home drills, to move the jaws in or out. This method of adjustment is quick and easy but offers a weaker grip on the object. Key-adjustable chucks use a metal key to gain the torque needed to tighten the chuck jaws. This is slower but results in a stronger grip.

A self-centering, or scroll, chuck usually has three jaws. It uses these jaws to hold the object in the center of the chuck. They are often found on lathes or milling machines. A four-jaw, self-centering chuck can be used to hold square objects in place.

A drill chuck is a specialized version of a self-centering three-jaw chuck. It is used to hold drill bits or other rotating tools. High-speed rotary tools may use a pin chuck inserted into the standard drill chuck to hold drill bits that are too small for the standard drill chuck to grasp.

The jaws of an independent jaw chuck can each be adjusted individually. This type of chuck most often has four jaws. They are not self centering, which means the operator must center them by hand. The result is greater precision when used by an experienced operator. They are used either to grip non-circular objects or to grip circular objects with precision.

Though most chucks have three or four jaws, it is possible to get chucks with six or even eight jaws. These are generally used for special jobs. Most are self centering but, because they are designed for a special job, are manufactured to a very precise standard.

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.