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 an Anchor Shackle?

M. McGee
By M. McGee
Updated May 17, 2024
Our promise to you
AboutMechanics 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 AboutMechanics, 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 shackle is a U- or O-shaped piece of metal secured with a bolt, pin or spring that connects items together. An anchor shackle is a specific kind of shackle that is used to secure a moving object to a fixed object. The shape of the anchor shackle allows the moving object to push and pull from several directions without creating a shearing force on the device. These shackles have many industrial uses, but are especially common on boats. There they do everything from holding rigging lines to securing the boat's actual anchor.

From a load standpoint, a shackle is a solid loop of metal. In order to be a true shackle, there cannot be any openings in the loop that makes up the fastener. Since the shackle would be of little use if it were simply a solid loop of material, it has an opening called a gate that is able to be closed. There are several methods used for closing the gate in the shackle in order to effectively create a single piece.

There are two common fastening methods for most shackle bolts or pins. For these shackles, the bolt or pin makes up a portion of the loop itself. When they are open, the bolt or pin that holds them shut is typically removed from the shackle entirely. When in use, a bolted shackle has a set of threaded loops on each side of the opening that allows the bolt to hold the shackle shut. A pin shackle is very similar, but the pin simply slides through the opening and is secured on both sides.

Spring shackles have either a spring or a tension system that allows a user to push the shackle open without removing the connecting piece. The gate opens by pressing into the shackle; that way, a load cannot accidentally push the gate outwards. While both bolt and pin systems are commonly used to fasten an anchor shackle, spring systems are not.

Anchor shackles connect to a fixed object and a moving one. The gate on the shackle is generally set to face the fixed object, and the bulk of the shackle faces the moving one. An anchor shackle is usually round; the rounder the shackle, the better it is at balancing the forces on it. The round shape allows the moving load to pull from any direction but still have the same relative force applied to the anchor shackle. A round shackle is generally lighter-duty than a U-shaped shackle of the same weight, but it can withstand changes in directional force that would damage the U-shaped version.

AboutMechanics 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

AboutMechanics, in your inbox

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

AboutMechanics, in your inbox

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