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A shackle is a u-shaped device that connects slings, chain, or rope to an object or to each other. It is used for various rigging and load securement applications, such as lifting, towing, or hoisting. A shackle has a removable pin that goes through the two ears of the u-shaped body. There are different types of shackles, such as anchor, chain, screw pin, and bolt, depending on the shape of the body, the type of the pin, and the material of the shackle.

Shackles are usually made from high-quality materials such as stainless steel, which is resistant to corrosion and other environmental factors. This increases the longevity of the shackle and reduces the risk of breakage or failure.

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Design Factor of 6:1. More ductile than alloy. Available in round pin, screw pin, bolt type.

Design Factor of 5:1. Stronger than carbon steel. Can achieve an equivalent WLL as carbon shackles in a smaller product design. Available in round pin, screw pin, bolt type.

In particular, inspect shackles carefully for any signs of bending, warping or stretching, which may indicate that the shackle is not coping sufficiently well with the load forces being placed on it. Bent shackles tend to be a sign of excessive side-loading forces, which can ultimately lead to catastrophic failure (particularly of D-shackles), while distorted or fractured pins should be replaced immediately.

Even if a pin remains entirely intact, it may not seat properly in the shackle if it's even slightly warped from its original shape, which dramatically increases the risk of loosening under load. Shackle pins should never be forced or hammered into place if they're reluctant to seat properly, and must never be replaced with a stand-in piece of hardware that wasn't designed explicitly for that purpose and shackle type.

Both shackles and clevises are U-shaped mechanical coupling devices that are usually closed by some type of fastener, whether a bolt or a threaded pin. In most cases, these U-shaped pieces are used to facilitate attaching a chain, a rope, or a wire rope for rigging purposes, hoisting, or towing applications.

Additionally, these types of fasteners are typically closed with a non-threaded clevis pin for easier uncoupling of farming equipment in towing applications. However, it's worth noting that they might be used in conjunction with a cotter pin that would prevent the clevis pin's accidental removal due to vibrations.

Also known as bow shackles, these have a generously-sized O-shaped loop that's better suited for multipoint connection.
More commonly known as D-shackle, these are shaped like a chain link and are thus narrower than typical anchor shackles. Their design reduces the rigging line movement, as they're designed to primarily take the load in-line.

When dropping an anchor, using "shackles" refers to the length of anchor chain that is let out. Each shackle of chain is typically about 27.5 meters (90 feet) long. So, when a sailor says they let out "three shackles" of chain, it means they have let out approximately 82.5 meters (270 feet) of chain. This helps to ensure that the anchor is securely set and that the boat or ship remains in place.

US Type Forged Screw Pin Chain or Dee Shackle G210

D-Shackles

D-shackles or chain shackles, also written as 'Dee-shackles', are, as the name implies, composed of a D-shaped body that's narrower than the widely flared 'O' form seen in most anchor or bow shackles. Instead, D-shackles are shaped more like a standard chain loop or link.
They're among the most common types of shackles found in a huge range of everyday scenarios, and the majority of other shackle types are essentially variations on the basic D-shape version. D-shackles are usually closed with a threaded pin or a clevis-type pin, and they're generally seen as suitable choices for moderate to heavy loads that are being lifted in line.
For so-called side loads, in which the lifting being done is not necessarily completely vertical, D-shackles aren't recommended as they can start to twist or bend if enough force is applied. In most side loading lifting applications, an anchor or bow-type shackle is the preferred configuration (see bow shackles, below).
Among the many different types of D-shackles available from suppliers and manufacturers today, some of the most common materials you'll see listed in product catalogues include stainless steel D-shackles, zinc-plated or galvanised steel D-shackles, and various forms of alloy steel D-shackles.

Bow shackles, also known as anchor shackles, are a more widely flared or O-shaped variant of the D-shackle format. One of the key advantages of bow shackles is that they're much better equipped for handling multiple loads from different directions without it becoming a significant side load situation, as the rounded shape of the body makes them able to support heavier payloads at various points around their circumference.
Bow or anchor shackles can also accommodate far wider lifting straps than the narrower D-shackle variants (for all lifting and rigging jobs, the chosen shackle should be able to accommodate the strap or sling without requiring excessive pinching of the fabric). The trade-off for these advantages is a lower overall weight tolerance than an equivalent gauge D-shackle, provided the lifting is done strictly inline for the latter.

You'll frequently see a wide range of small, medium and large D-shackles or bow shackles listed for sale by size, and frequently the product information might include pin size as well. However, be aware that the key measurements given under any D-shackle specifications will be the diameter of the material used in the body section - the pin measurements will usually be longer than this.

Other measurement information - such as the pin length, or the distance between the shackle body eyes when new - is worth retaining access to throughout the working lifespan of the shackle, as it can help to diagnose and identify warping or bending over time. A shackle whose eye-to-eye distance exceeds that listed in the manufacturer's specifications should not be used.

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A: When attaching a shackle, it is recommended to use a shackle-pin wrench to tighten the pin securely and avoid over-tightening, which can lead to deformation or damage.

A: There are various types of shackles, such as anchor shackles, bow shackles, chain shackles, clevis shackles, d-shackles, screw-pin shackles, and twist shackles. Each type has a different design, size, strength rating, and application.

A: A shackle key is a tool used to unscrew or tighten the pin of a screw-pin shackle. It usually has a loop or handle at one end and a pointed end or nut driver at the other end. Shackle keys can make it easier to secure or release a shackle in tight or hard-to-reach places.

Q: What are the advantages of using a quick-release shackle?

A: A quick-release shackle allows for faster and easier attachment and detachment of a load, without the need for tools or manual unscrewing of the pin. This can save time and effort in situations where frequent changes are needed.

A: A bow shackle has a wider bow-shaped body that allows for a larger clearance and a broader connection point. It's often used for multiple-leg slings, hooks, or bridles. A dee (or d) shackle has a more compact U-shaped body that's less likely to rotate or flip over, making it suitable for single-leg slings or applications where space is limited.

A: A shackle should be stored in a clean, dry, and corrosion-free environment when not in use. It's recommended to coat the shackle with a rust inhibitor or lubricant to prevent the pin from seizing or the body from rusting.

A: A safety pin shackle is a shackle that has a safety pin or cotter pin on one end of the pin, which prevents the pin from accidentally coming out of the body or becoming unscrewed. Safety-pin shackles are commonly used in lifting or hoisting applications where extra security is needed.

A: Yes, shackles can be used in overhead lifting as long as they are load-rated, properly installed, and used with compatible slings, hooks, or chains. However, it's recommended to use other types of lifting gear, such as eye bolts, swivel hoist rings, or lifting clamps, in situations where side loading or rotation could occur.

Q: What is the difference between a standard shackle and a high-capacity shackle?

A: High-capacity shackles are designed to accommodate heavier loads than standard shackles and typically have a larger WLL and safety factor.

A: Yes, shackles can be used for lifting loads vertically, as long as they are load-rated and meet the weight capacity requirements of the load.