What Makes Our American-Made Super Strong Shackle “Super”

What Makes Our American-Made Super Strong Shackle “Super”

Designed and forged in Chattanooga, Tennessee, American made super strong shackle CM Super Strong shackles are carbon-type shackles with strength ratings that are up to 50% stronger than comparable sized carbon shackles. As a result, they are designed with a 6:1 safety design factor.

By using a special blended material, Columbus McKinnon is able to manufacture Super Strong shackles without requiring the quench and temper process. This gives our Super Strong shackles a higher working load limit (WLL) and greater design factor.

Our microalloy material is designed to be air cooled from normal forging temperatures. This air-cooling process eliminates the potential for errors in hardness and strength or quench cracks in the heat treating process.

The strength level of the microalloy forgings will be higher than the normal strength to hardness correlation allowing for greater ductility before failure.  The microalloy has the ability to distribute strain throughout the section more uniformly than conventional steels.  At the same hardness the microalloy will be stronger.

Below are Comparison Testing results of CM Super Strong Shackles versus Standard Carbon Shackles.  While all of the CM shackles performed above their ratings, the Super Strong shackle performance was superior.


American-made super strong shackle

Questions often arise about the difference between our Industrial/Government shackles and the Super Strong shackles. An Industrial/Government shackle is a Super Strong shackle de-rated to meet – not exceed – the Federal Specification RR-C-271. That means it has the same dimensions and performance characteristics as a Super Strong shackle but is stamped with specifications to meet government requirements.

1″ Super Strong shackle will be stamped 10 Ton WLL
1″ Industrial/Government shackle will be stamped 8 1/2 Ton WLL

But don’t just listen to us. Listen to an impartial opinion and see the results of a test performed by Arizona Wire Rope. This distributor tested on a Tonzilla 500,000 lb pull tester comparing the CM Super Strong shackle to our competitor’s shackle. Check out the results for yourself!

We have a full range of sizes and finishes in the Super Strong Shackle product offering. Click here to view our newest CM Shackle Technical Brochure.

Troy Raines

Troy Raines is the Chain & Rigging Product Engineering Manager at our CMCO Chattanooga Forge Operations.

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7 Replies to “What Makes Our American-Made Super Strong Shackle “Super””

  1. Hello Brian,
    Thanks for your inquiry. I will forward your request via email to our contact in your region. They will be in touch with you shortly.
    Many thanks!

  2. I am enquiring about a 2.5 ton Super Strong dee shackle with screwed pin.
    Please forward availability & cost incl freight.

    Thank You
    Brian Hollingworth
    Adelaide, South Australia

  3. Hello Brian,

    Thanks for your comment. I have shared your request with our inside sales team and they will be reaching out to you on Monday with more information. We appreciate your interest!


  4. Al,
    Each and every rigging situation has its own set of risk. In the end, the world has to rely on knowledgeable and well trained riggers like yourself to make the best decisions for each lift. That’s why CMCO has expanded its training program. If you see someone out there that needs some help, please send them our way (www.cmcodepot.com) Together we will rig and move the world!


  5. Shackles have an amazing load capacity, especially these. Unfortunatly if the rigger does not use them properly its a moot point. Nothing scarier than seeing loads hung by an upside down shackle!

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