Jeamar Winches Product Catalog

Loads on Sheaves and Blocks

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.

2000 Pounds	1840 Pounds
1410 Pounds	760 Pounds

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 fritional losses in the system.