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Climb Higher Blog - A blog about Tower Climbing Safety Gear

Shackles 101

When it comes to lifting and rigging, knowing the hardware you are using is an important part of safety. A common piece of hardware used in lifting and rigging is a shackle. A shackle is a metal link, typically U-shaped, closed by a bolt or screw. Shackles are typically made from forged steel to provide very high tensile strength. Many US contractors have begun requiring domestically made shackles. This week our Gear Experts® are going to break down shackles.

Domestic vs. Foreign

  It was mentioned above, but now it’s time to break it down further. Many US contractors have started requiring shackles that are made domestically. A domestic shackle is a shackle that has been made in the United States. They are often preferred to foreign made shackles due to better manufacturing and testing processes. Crosby, one of the most popular shackle manufacturers in the world, has a full selection of domestically manufactured shackles to meet your needs no matter what the job site requires.

Screw Pin vs. Bolt Shackles

  Each job is unique and that means requirements are different. Not to mention, contractors may have preferences in addition to requiring domestic shackles. Apart from common things like U-shape size and capacity, the main difference between shackles will be whether they are a screw pin or a bolt shackle.

Screw Pin

A screw pin shackle is pretty self-explanatory. It is a type of shackle where the pin has a male threaded end, which tightens into the female threads in the body of the shackle. These shackles are popular because of their ease of use and are most commonly used on jobs that don’t require heavy duty attachment.


A bolt shackle is pretty self-explanatory as well. It is a type of shackle where the pin has a male threaded end which is fed through the body of the shackle and secured with a bolt on the outside of the shackle. These shackles aren’t as easy to use as the screw pin shackles because of the requirements of securing the bolt to the pin. However, bolt type shackles are typically a better solution for jobs that require heavy duty attachment.

Standards: ASME B30

  When it comes to lifting and rigging, which happens to include shackles – if you’re using them in a lifting and rigging capacity, the ASME B30 Standard is something that you need to be mindful of. The ASME B30 standard focuses on setting the standards for materials, rated loads, identification, inspection, repair, and removal. ASME B30 covers blocks and a range of other hardware used for lifting and rigging. We covered ASME B30 and provided a full breakdown of the standard in a previous blog post. You can find that post here. If you’ve got questions about shackles, standards, or domestic manufacturers, click here to contact one of our Gear Experts®. → Click here to see our full selection of shackles → Click here to see our full selection of Crosby hardware → Click here to see our full selection of lifting and rigging equipment **The content of this blog is not intended to replace proper, in-depth training. Manufacturer’s instructions must also be followed and reviewed before any Fall Protection Equipment is used.

Shackles 101: The Video


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  We're also proud to announce Gear Up with Gear Experts® - A podcast dedicated to at-height, industry, and construction. Gear Up with Gear Experts® is available via your podcast listening platform of choice and in each episode, the hosts (Alex Giddings & John Medina) bring in a gear expert or industry leader to talk about gear, gear safety, tips, and tricks. To find out more about the show and sign up for alerts, head on over to  

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