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Tackle Block Information

Sheave Size & Wire Rope Strength

Strength Efficiency
Bending wire rope reduces its strength. To account for the effect of bend radius on wire rope strength when selecting a sheave, use the table below:

Ratio A Strength Efficiency Compared to Catalog Strength In %
40 95
30 93
20 91
15 89
10 86
8 83
6 79
4 75
2 65
1 50
Sheave Size & Wire Rope Strength
Example:
To determine the strength efficiency of 1/2” diameter wire rope using a 10” diameter sheave:

Sheave Size & Wire Rope Strength

Refer to ratio A of 20 in the table then check the column under the heading “Strength Efficiency Compared to Catalog Strength in %”…91% strength efficiency as compared to the catalog strength of wire rope.