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The stress on a sheave or block varies with the degree of angle between the lead and load lines. When the two lines are parallel, 1000 pounds on the lead line results in a load of 2000 pounds on the hook. As the angle between the lines increases, the stress on the hook is reduced as illustrated below.

To determine the stress on a hook, multiply the pull on the lead line by a suitable factor from the following table. All loads shown ignore frictional losses in the system.

Angle	Factor
5°	1.998
10°	1.99
15°	1.98
20°	1.97
25°	1.95
30°	1.93

Angle	Factor
35°	1.90
40°	1.87
45°	1.84
50°	1.81
55°	1.77
60°	1.73

Angle	Factor
65°	1.69
70°	1.64
75°	1.58
80°	1.53
85°	1.47
90°	1.41

Angle	Factor
95°	1.35
100°	1.29
105°	1.22
110°	1.15
115°	1.07
120°	1.00

Angle	Factor
125°	.92
130°	.84
135°	.76
140°	.68
145°	.60
150°	.52

Angle	Factor
155°	.43
160°	.35
165°	.26
170°	.17
175°	.08
180°	.00



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