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 Coupling?

M. McGee
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 jaw coupling is a device that connects two shafts together. This style of coupling is primarily designed as a method of reducing vibrations caused by minor misalignments in the two shafts. In addition to its vibration reduction, a jaw coupling is nearly fail-proof, as it connects together in a gear-like manner. A jaw coupling will transmit torque well, but the loose middle area of the coupling prevents it from safely transferring large bursts of energy.

All couplings are used to connect shafts together. These devices are generally found connecting a powered system, the driver, to a non-powered system, the driven. Couplings connect the end of the drive shaft to the end of the driven shaft in order to move power from one system to the other. Using a coupling allows the shafts to have slight misalignments and variation without damaging the system. In addition, they allow the piece to separate from one another for repair or replacement.

The construction of a jaw coupling is quite simple. The coupling consists of three parts; two metal pieces that connect to the drive and driven shafts and an elastic centerpiece called a spider. The two metal pieces look like a nut-style fastener with a couple of blocky teeth. These teeth connect the two halves of the connector together like the teeth on a gear. It is the appearance of these interlocking teeth that gives the coupling its name.

The spider is what makes a jaw coupling different from other couplings. This elastic piece sits in between the two metallic jaws. This piece looks like a disk with a number of small arms, giving it a spider-like appearance. These arms fit in between the teeth on the metallic jaw parts of the coupling, creating cushions for the teeth.

As the drive shaft turns, the interconnected teeth of the coupling cause the motion to transfer to the driven shaft. The spider protects the teeth and reduces wear and vibration. The elastic center also gives the coupling a significant freedom of movement, allowing shafts that are misaligned to work together properly.

In general, a jaw coupling can transfer significant amounts of torque without failure. Since the coupling works via a physical connection, the interlocking teeth, very little energy is lost during the transfer. On the other hand, the elastic connection makes transferring burst power difficult, as the sudden deformation of the coupling can burst the elastic spider.

The spider is the greatest weakness of the coupling. Even though it is the portion that gives it its superior vibration-dampening capabilities, it is also physically weak. Since the jaw coupling is physically connected, it will continue to work if the spider comes apart. The connection will become looser, and the coupling loses several of its strengths, possibly causing trouble in the system if not repaired.

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.
M. McGee
By M. McGee , Former Writer
Mark McGee is a skilled writer and communicator who excels in crafting content that resonates with diverse audiences. With a background in communication-related fields, he brings strong organizational and interpersonal skills to his writing, ensuring that his work is both informative and engaging.

Discussion Comments

M. McGee

M. McGee

Former Writer

Mark McGee is a skilled writer and communicator who excels in crafting content that resonates with diverse audiences....
Learn more
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.