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Correct Shackle for Your Lifting Sling

By Tim Muprhy 1 years ago No comments

It is imperative to select the right shackle for your lifting sling. In addition to making lifting easier, this enhances overall safety. The decision depends on two things, checking recommendations from the sling manufacturer and using a little bit of common sense.

The Right Lifting Sling

First obtain the right lifting sling for your requirements.

You will need to know what type items you are moving, weights of the items, and other pertinent information. Slings are used, not only for lifting, but also pulling and holding loads.

Typically, slings are made of chain, wire rope, or synthetic ropes, synthetic web and other synthetic fiber configurations. If you are unsure of which sling type is best for your application, contact us at [email protected]

Appropriate Shackles

The next step is to choose the right shackle to connect the sling to whatever it is lifting, pulling or holding. For this, you need to know the details about your sling. One for instance – you do not want to use a shackle with a size (bar diameter in the bow) that is smaller in diameter than the wire rope in a standard eye and eye wire rope sling. A D:d (Shackle Diameter : Wire Rope Diameter) ratio of less than 1:1 will cause you to have to reduce the Working Load Limit of the wire rope sling. Consult Industry recommendations for the type sling that you are using.

Choose shackles based on the type of pull. For straight pulling, chain shackles tend to work best. For multidimensional pulls, an anchor shackle is recommended. Consult the manufacturer for side loading recommendations. Shackles come in different materials, including stainless steel and galvanized steel and plain painted steel. For marine applications, stainless steel or hot dipped galvanized is best.

You also need to select a pin type. Among the different options are bolts, screw pins, and round pins, plus some more obscure types. Of these, the easiest to connect and disconnect are screw pins. The Working Load Rating of your shackles should equal or exceed the rating of the sling you are rigging. Some applications require permanent connections of a Bolt Type Shackle, as when rigging slings on items sent offshore in the Oil Industry.

For overhead lifting use shackles with pins made from alloy and the shackle body from forged carbon steel that has been heat-treated. For industrial lifting applications, along with tie-down and towing, these forged shackles are superior.

Strength Varies with Grade

If you find that the standard Carbon Steel Shackle that you have selected is not strong enough, you do have some options. There are stronger grade shackles with the same dimensions.

  • CM Super Strong Shackles are carbon-type shackles with strength ratings that are 17 to 50% stronger than comparable-sized carbon shackles. As a result, these shackles are designed with a 6:1 design factor.
  • Alloy Shackles are designed with a 5:1 design factor and have a strength rating approximately 50% higher than a comparable-sized carbon shackle and about 25% stronger than Super Strong shackles.

Have a custom requirement? For quick manufacturing or free same day shipping, email us at [email protected] today

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