Wire Rope Slings

Sling angle and influence on capacity

Slings angles affects ropes capacities.

Wire rope sling - load capacity

If angle - alpha - is measured between

  • the vertical line (as with gravity force), and
  • the rope or wire

the relative capacity compared to a vertical straight lifting is reduced as indicated below:

Angle
- α -
(degrees)
Reduction Factor 
- f -
0 1.000
10 0.985
20 0.940
30 0.866
40 0.766
50 0.643
60 0.500
70 0.342

Example - Capacity of a Single Rope or Wire

The capacity of a single rope that follows a vertical line is 100% since the reduction factor is 1.

If the weight of a body is W - the load in the wire is

F = W                                     (1)

For a body with weight 1000 N the load in the rope can be calculated

F = 1000 N

Example - Capacity of Two Ropes (or Wires)

Two wires or ropes follows the vertical line

The capacity of two wires that follows the vertical line is 100% since the reduction factor is 1.

If the weight of a body is W - the load in each wire is

F = W / 2                                  (2)

For a body with weight 1000 N the loads in the ropes can be calculated

F = (1000 N) / 2

   = 500 N

Two wires - or ropes - with angle 30o to the vertical line

The capacity of two wires with angle 30o to the vertical line is 86.6% since the reduction factor is 0.866.

If the weight of a body is W - the load in each wire is

F = (W / 2) / cos(30o)

   = 1.15 W / 2                                         (3)

For a body with weight 1000 N the loads in the ropes can be calculated

F = 1.15 (1000 N) / 2

   = 575 N

Related Topics

  • Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more
  • Statics - Loads - force and torque, beams and columns

Related Documents

Tag Search

  • en: wire rope slings
  • es: eslingas de cable
  • de: Seilschlingen

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