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1111 IS-17880
rateD CapaCitY
Choker hitCh anGLeS
When lifting and turning a load using a choker hitch, it is
not uncommon to bend the body of the sling around the
choker loop and have a severe bend occur around the
body at this point.
For choker angles of 120° or less, the choker rating must
be reduced by multiplying the corresponding factor
times the slings standard choker rated capacity.
effect of anchor Shackle pin or Crane hook on Sling eye
Damage to slings can occur if the wrong size pin or hook is used. The width of the pin or
hook should never exceed the natural inside width of the eye.
Sling capacity decreases as choke angle
decreases.
1,000 lbs.
30
◦
60
◦
90
◦
120
◦
135
◦
180
◦
LOAD
D
reduction
Factor (rF)
angle From
horizontal
tension
Factor (tF)
1.000
90°
1.000
0.996
85°
1.004
0.985
80°
1.015
0.966
75°
1.035
0.940
70°
1.064
0.906
65°
1.104
0.866
60°
1.155
0.819
55°
1.221
0.766
50°
1.305
0.707
45°
1.414
0.643
40°
1.555
0.574
35°
1.742
0.500
30°
2.000
effect of angle Chart
reduced Capacity
increasing tension
Example:
Vertical Choker rating of each sling = 6,000 lbs.
Measured Length (L) = 6 ft.
Measured Height (H) = 4 ft.
Reduction Factor (RF) = 4 (H) / 6 (L) = .667
(RF) x 6,000 lbs. = 4,000 lbs of lifting capacity per sling
Example:
Load weight = 1,000 lbs.
Rigging - 2 slings in vertical hitch
Lifting weight (LW) per sling = 500 lbs.
Measured Length (L) = 10 ft.
Measured Height (H) = 5 ft.
Tension Factor (TF) = 10 (L) / 5 (H) = 2.0
Minimum Vertical Rated Capacity required for
this lift = 500 (LW) x 2.0 (TF) = 1000 lbs. per sling
LW = 500 lbs.
LW = 500 lbs.
angle of Choke
Factor
Over 120°
1.00
90° - 120°
0.87
60° - 89°
0.74
30° - 59°
0.62
0° - 29°
0.49
plies of
Web
Sling Width (in.)
1
2
3
4
6
8
10
12
1
8½
10
11
12
16
20
24
24
2
8½
10
11
12
16
20
24
24
3
10
12
14
16
18
24
24
24
4
10
12
14
16
18
24
24
24
