Shackle Sizes & Materials: What You Need to Know

Get up-to-date information on various shackle sizes and materials, including detailed descriptions and measurements, in this easy-to-use beginner guide!

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Shackle Sizes

When measuring the length of rigging shackles, it is essential to note that the measurements provided are based on the shackle body diameter rather than the shackle pin diameter. Since the diameter of the shackle pin is usually longer than the shackle body diameter, proper measurement should be taken to ensure accurate sizing and safety. The picture below provides a guide on how to measure shackle length accurately:

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If the size of the shackle we choose is unsuitable, it will affect the connection and use. Let’s look at some of the critical dimensions that affect the link.

1. Jaw opening: A> plate eye
   We usually connect the shackle with the plate eye, and the thickness of the plate should be smaller than the opening of the shackle. Otherwise, it cannot be connected.
2. Shackle pin diameter: B<eye, hole
   The diameter of the connection hole should be larger than the diameter of the bearing pin so that it can be connected.
3. Body diameter: P<eye, hole
   The main body section of the shackle is not circular as we usually think but oval, and its size should be smaller than the size of the hole it is connected to.
4. Ear width: F<eye, hole
   When the main body of the shackle needs to be inserted into the connecting hole through the ear, the size of the ear must be smaller than the size of the connecting hole.
5. Shackle length: C< link structure size
   This size refers to the internal length of the shackle, that is, the effective use length of the shackle, not the external dimension of the shackle. When the shackle participates in the composition of the hoisting structure, the usable length should be calculated with C. At the same time, for the system connected with the shackle, C must be greater than the size of the connection structure occupying the inside of the shackle so that there is enough space for operation and activities to avoid jamming.

When planning and making rigging shackle purchases, it is imperative to consider the appropriate material thickness. This specification will inform the suitability of the shackle when attempting to lift specific payloads and is one of the core content points to remember when buying a product. The manufacturer’s guidelines for the safe working load (SWL) should be consulted first and foremost to ensure that one is using an appropriate shackle, as a product’s rated tolerance is also often visible on the actual shackles themselves.

How to Measure & Size Shackles?

When determining the size of a rigging shackle for a specific application, it is essential to measure the bow section of the shackle as opposed to the pin size. Additionally, be sure not to use a shackle if the distance between its two eyes is more significant than what is stated in the manufacturer’s tables.

Shackles Material

Lifting shackles are essential components for lifting operations, and they must be carefully chosen due to the different types of loading capacity, performance, and environment in which they are used. The raw materials used to make them are divided into three categories: Carbon Steel Shackles, Alloy Steel Shackles, and Stainless Steel Shackles. These materials determine the effectiveness and performance of the shackle.

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Carbon Steel Shackles

Alloy Steel Shackles

Grade 80 alloy steel shackles offer enhanced mechanical properties and significantly improved loading characteristics compared to carbon shackles. These versatile components are designed to operate in challenging and extreme conditions, with a 4:1 or 6:1 safety factor. Even better, these shackles offer the same workload limit (WLL) as carbon shackles but with a smaller, lighter design.

Stainless Steel Shackles

Stainless steel shackles boast a chromium oxide film on their surfaces, giving them excellent corrosion resistance and making them suitable for saltwater or chemical environments. This makes them ideal for marine applications, although they are more expensive than galvanized shackles.

The above is the solution of shackles size, measurement, material selection, etc. If you need more answers about shackles, you can contact us, and we will reply as soon as possible.

Important Rules of Using Shackles

Shackles and various rigging hardware serve as crucial components for securely linking two slings to a lifting apparatus. Adhering to these guidelines is imperative when employing shackles to ensure safe and efficient operations.

• Make sure to fasten the slings onto the bow section of the shackle rather than the pins.
• Employ a shackle with a bow-shaped design when linking the slings to the lifting device’s hook.
• Ensure that the angle formed by the slings does not exceed 120°.
• Confirm that the pin is flush with the exterior surface of the shackle body or slightly protruding.
• Verify that the pin head comes into contact with the shackle body securely.
• Properly secure the bolt and nut, and remember to attach the cotter pin for added safety.

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.

It’s important to keep appropriate sizing (i.e. material thickness) in mind when planning and making a shackle purchase, as this is the key specification that will dictate the suitability of a given shackle for use under certain loads.

The first port of call for judging the suitability of a shackle for handling a certain payload should always be the manufacturer guidelines for safe working load (SWL). Sales should be backed up with clear information in this regard, and a product’s rated tolerance will often be visibly imprinted on the shackle itself.

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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