What would be the rating of each sling
rigged at this angle?

1. Calculate the Reduction Factor [RF].

a. Using the angle from horizontal, read across the Angle Chart to the corresponding number of the Reduction Factor column

-OR-

b. Divide sling height* [H] by sling length* [L].

2. Reduction Factor [RF] x the sling's rated capacity for the type hitch that will be used = Sling's Reduced Rating.

*Measured from a common horizontal plane to the hoisting hook.

What capacity sling do I need?

1. Determine the weight that the Sling will be lifting [LW].

2. Calculate the Tension Factor [TF].

a. Using the angle from horizontal, read across the angle chart to the corresponding number of Tension Factor column

-OR-

b. Divide sling height* [H] by sling length* [L

3. Lifting Weight [LW] x the Tension  Factor [TF] = Minimum Sling Rating for the type of hitch that will be used

*Measured from a common Horizontal plane to the hoisting hook.

Choker Hitch              Vertical Hitch

         

              Vertical Basket Hitch

 

            Reduced Capacity                                                                         Increasing Tension

                                  

Example:                                                                                          Example:

Vertical Choker rating of each sling = 6,000 lbs.                                  Load Weight = 1,000 lbs. Rigging - 2 slings in vertical                     Measured Length (L) = 6 ft.                                                               Hitch Lifting Weight (LW) per sling                                                Measured Height (H) = 4 ft.                                                               = 500 lbs. Measured Length (L) = 10 ft.                                         Reduction Factor (RF) = 4 (H) ÷ 6 (L) = .667                                       Measured Height (H) = 5 ft.                                                            Reduced sling rating in this configuration = .667                                 Tension Factor (TF) = 10 (L) ÷                                                                 (RF) x 6,000 lbs. = 4,000 lbs. of lifting capacity per sling                     5 (H) = 2.0 Minimum Vertical  Rated                                                                                                                                            Capacity required for this lift = 500 (LW) x 2.0 (TF) = 1,000 lbs. per sling

                                                              Effect of Angle Chart

Sling capacity decreases as the angle from horizontal decrease. Sling angles of less than 30° are not recommended.

Reduction Factor

Angle From Horizontal

Tension Factor (TF)

1.000

90º

1.000

0.996

85º

1.004

0.985

80º

1.015

0.966

75º

1.035

0.940

70º

1.064

0.906

65º

1.104

0.866

60º

1.155

0.819

55º

1.221

0.766

50º

1.305

0.707

45º

1.414

0.643

40º

1.555

0.574

35º

1.742

0.500

30º

2.000

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