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Screw Pin And Bolt Shackles: Key Differences Explained

Screw Pin And Bolt Shackles: Key Differences Explained

Table of Contents

Shackles are like versatile connectors in your lifting gear toolbox, linking everything from slings to chains. But here’s the twist: their bolt type makes a big difference. Let’s compare screw-pin vs. bolt shackles, understand their unique features, and pick the perfect bolt for your lifting needs.

What Are Screw Pin Shackles?

Discover our range of screw pin shackles – engineered with threaded pins that effortlessly secure your loads. The screw pin design ensures a sturdy, lasting connection by threading through one ear and screwing into the other. With proper tightening, the pins engage fully, anchoring securely to the shackle’s ears while the shoulder rests against the body. Explore UULIFTING’s assortment of screw pin shackles, available in diverse sizes and constructions, from galvanized to stainless steel options.

Lifting Screw Pin Shackles
Screw Pin Shackle

These shackles with screw pins are great for fast rigging tasks. They connect and disconnect quickly, ideal for temporary jobs. Compared to other types, they’re the quickest option.

What Are Bolt-On Shackles?

Bolt type shackles are similar to screw pin shackles but have a few key differences. Instead of a threaded pin, they use a bolt and a cotter pin to secure the shackle. This combination eliminates the need to screw the pin into the other ear. The cotter pin on the end of the shackle bolt adds an extra layer of security, earning them the nickname “safety shackles.”

Bolt-type shackles function much like screw pin shackles, but they offer lasting security. Their enhanced strength is ideal for extended use or when there’s a risk of loads shifting on the pin, potentially causing other types of pins to fail or loosen.

Bolt Shackles
Bolt Shackles

Which Shackle Is Right For Me?

When choosing between screw pin and bolt type shackles, think about these factors to find the best fit for your lifting, rigging, and towing needs. Both options provide valuable advantages tailored to various applications.

1. Security

Ensuring safety is crucial when using shackles for any task. They must remain secure and intact throughout the job. You can trust that both pin types will withstand various rigging tasks.

Yet, the bolt-type shackle offers superior security compared to the screw pin. Moreover, the bolt and cotter pin features used to secure this shackle make it an excellent option.

2. Permanency

When choosing the right shackle, it’s crucial to consider how long you’ll need it – whether it’s a short-term fix or a lasting solution. Screw-pin shackles aren’t built for extended use. One key reason is the need for frequent adjustments to tighten the screw. As mentioned earlier, the screw is fully engaged during operation, but over time, it gradually loosens with each rigging task.

In contrast, bolt shackles excel in long-term applications and require minimal readjustment even after numerous uses. Their unthreaded pin is secured simply with a cotter pin and bolt, offering greater durability than the threaded pin found in screw-pin shackles.

3. Style Of Application

First, figure out the kinds of loads you deal with and how you intend to utilize these products with them. Both shackles are suitable for similar tasks such as rigging, securing, pulling, hanging, or lifting. However, certain tasks may favor one shackle over the other. For instance, screw pin shackles are ideal for temporary uses like securing and pulling due to their swift release mechanism and threaded design. Bolt shackles are better suited for assembling multi-leg lifting slings and hanging wire rope on steel structures.

NOTE: Consider the working load limit (WLL) of your entire rigging operation, including the shackles.

4. Possible Sliding & Rotation

Consider if your load might slide or rotate during rigging. Screw pin shackles aren’t ideal for loads prone to rotation, like lifting slings.

Bolt shackles better manage rotation and warping. The unthreaded pin, secured by a bolt and cotter pin, avoids the strain of the threaded pin face.



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