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The maximum included angle for hooks with a row sling rigging is 90 degrees. This is primarily due to the need for maintaining optimal load stability and safety during lifting operations. At angles greater than 90 degrees, the forces acting on the rope or sling can lead to increased stress, which may result in slippage or failure of the rigging equipment.

In rigging practices, maintaining an angle of 90 degrees helps to distribute the load evenly and minimizes the risk of accidents, ensuring that the rigging system operates within its designed limits. This is an important safety standard that riggers follow to prevent potential hazards associated with overloading or improperly secured loads.

Angles beyond this range can compromise the security of the load, making it crucial for operators to be aware of the recommended maximum included angle when using hooks in a rigging context.