How to Determine Sling Angles and Loads – Hoist Central

Sling Angles and Loads

How to Determine Sling Angles and Loads

After identifying the material type, the next consideration must be the rated lifting capacity required. Remember that the rated lifting capacity of the sling must often be greater than the weight of the load to be lifted. Because the angle of pull on the leg of a sling varies with the leg angle, forces may be exerted on a sling greater than the user may expect. Fell free to consult the sling angle factor chart for rigging calculations. To calculate the load on a particular sling leg proceed as follows:

  1. Take the total weight of the load and divide this by the number of legs supporting the load. For example, assume a 2000 pound load is to be supported by 2 legs of a sling. The above will give a total minimum weight on each leg of the sling of 2000 pounds divided by 2 legs or 1000 pounds.
  2. Determine the load factor by observing the load factor chart below. Ex. Assume that the leg angle will be 60°. The load factor for 60° from the load factor chart is 1.154.
  3. Multiply the load factor times the minimum weight to be supported by the leg, i.e. 1000 pounds times 1.154=1154 pounds. The rated sling capacity needed is then 2308 (1154x2) pounds in BASKET CAPACITY to safely lift the 2000 pound load.
 Leg Angle  Load Factor
 90°  1.000
 85°  1.003
 80°  1.015
 75°  1.035
 70°  1.064
 65°  1.103
 60°  1.154
 55°  1.220
 50°  1.305
 45°  1.414
 40°  1.555
 35°  1.743
 30°  2.000



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