Page 309 - Green Pin Product Catalog
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Loads on blocks
The WLLs of our blocks are the maximum loads to be applied to the blocks and their connecting fittings. BLOCKS
The load on a sheave or block varies with the angle between the lead and load line. See figure 1. When the
two lines are parallel, 1 t on the lead line results in a load of 2 t on the fitting. As the working angle between
the lines increases, the load on the fitting is reduced by the angle factor as per table 1. All loads shown ignore
frictional losses in the lifting system.
Table 1 Figure 1
working angle
angle factor
0° 2
10° 1.99
20° 1.97
30° 1.93
40° 1.87
45° 1.84
50° 1.81
60° 1.73
70° 1.64
80° 1.53
90° 1.41
100° 1.29
110° 1.15
120° 1
130° 0.84
135° 0.76
140° 0.68
150° 0.52
160° 0.35
170° 0.17
180° 0
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