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Effects of Angle of Lift on Sling Rated Capacity

Using slings at an angle can become deadly if that angle is not taken into consideration when selecting the sling to be used. The tension on each leg of the sling is increased as the angle of sling, from horizontal, decreases. It is most desirable for a sling to have a larger angle of lift, approaching 90-degrees. Lifts with angles of less than 30-degrees from horizontal are not recommended. If you can measure the angle of the sling, or the length and height of the sling as rigged, you can determine the properly rated sling for your lift. This may also be called a Tension Factor, but we will refer to this as our Load Angle Factor [L.A.F.].

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You can start off by asking yourself the most basic question: What capacity sling do I need?

  1. Determine the weight that the sling will be lifting; L.A.F.
  2. Calculate the L.A.F.
  • Using the angle from horizontal, read across the Angle Chart to the corresponding number of L.A.F. Column.


  • Divide sling length* [L] by sling height* [H]
  1. Lifting Weight [LW] x the L.A.F.] = Minimum Sling Rating, for a single-leg, for the type of hitch that will be used.


*Measured from the horizontal plane, bearing point to the bearing point on the hoisting hook.


Download the Rigging Section of the Lifting Gear Hire catalog for more information about rigging equipment types and specifications.


Download LGH Rigging Specification Catalog 




Illustration and graph information courtesy of and copyright Jerry Klinke, Acratech, www.acratech.com


Matt Kral

Matt Kral

A graduate of Lewis University’s award-winning journalism team in 2010 as both section editor and copy editor, current active member of the Lifting Gear Hire sales force. Matt Kral brings his experience in the heavy equipment rental industry and insight into what information is desired in the field to this blog to provide relevant content to the customers of the largest lifting equipment rental company in the United States.

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