Loads on Sheaves and Blocks

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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

Important: Due to our policy of continuing development, all specifications are subject to change without notice. Users of these products are responsible for ensuring their suitability for the application in which they are being used.

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