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 Degree | Sling Reduction Factor |
---|---|
90º | 1 |
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

Wire Rope Slings - ASME B30.9
Angle of Choke (Degrees) Equal to or greater than | Angle of Choke (Degrees) Less than | Reduction Factor |
---|---|---|
121 | 180 | 1 |
90 | 121 | .87 |
60 | 90 | .74 |
30 | 60 | .62 |
0 | 30 | .49 |
Web Slings & Roundslings - WSTDA
Angle of Choke (Degrees) Equal to or greater than | Angle of Choke (Degrees) Less than | Reduction Factor |
---|---|---|
120 | 180 | 1 |
105 | 120 | .82 |
90 | 105 | .71 |
60 | 90 | .58 |
0 | 60 | .50 |
Choker Hitch Capacity x Reduction Factor = Reduced Choker Hitch Capacity
Additional References:
www.asme.org
www.wstda.com
www.osha.gov