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Sling Angle is the angle measured between the horizontal plane and the sling leg or body. When selecting a sling to carry a given load, it is important to consider the angle at which it is going to be used. The angle is vey important and can have a dramatic effect on the rated capacity, due to the increase of tension caused by the angle.

As an example, one sling in a basket hitch or two slings attached to one crane hook are different applications involving different sling angles. The degree of the angle will determine how much the capacity will be reduced. To determine if a particular sling will have the capacity required, take the angle between the sling leg and the horizontal, then multiply the sling’s rating by the factor provided in the accompanying table.

In the example below, you will see how the 1,000lb capacity of a sling used in a vertical basket hitch is reduced taking these factors into consideration.

3 Basic Hitches

Effects of Sling Angles

Sling Reduction Chart

Angles in DegreeSling Reduction Factor
90º1
85º.996
80º.985
75º.966
70º.940
65º.906
60º.866
55º.819
50º.766
45º.707
40º.643
35º.574
30º.5

Sling Capacity & Choker Hitch Angles

Choker Hitch Angles

Wire Rope Slings - ASME B30.9

Angle of Choke (Degrees)
Equal to or greater than
Angle of Choke (Degrees)
Less than
Reduction Factor
1211801
90121.87
6090.74
3060.62
030.49

Web Slings & Roundslings - WSTDA

Angle of Choke (Degrees)
Equal to or greater than
Angle of Choke (Degrees)
Less than
Reduction Factor
1201801
105120.82
90105.71
6090.58
060.50

Choker Hitch Capacity x Reduction Factor = Reduced Choker Hitch Capacity

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