What is the maximum included angle for using a shackle to attach multiple slings?

The maximum included angle for using a shackle to attach multiple slings is 120 degrees. This angle is significant in lifting operations because it ensures that the force is distributed correctly across the slings. When the angle is kept at or below 120 degrees, it helps to minimize excessive loading on the slings, reducing the risk of slippage or failure.

In practice, as the angle increases beyond 120 degrees, the efficiency of the slings decreases, which can lead to increased loads on the individual slings and potentially hazardous situations. Hence, adhering to this maximum angle not only promotes safety but also ensures that the lifting equipment operates within its rated capacity.