With two shackles or sling eyes in a hook, what is the suggested maximum included lifting angle?

With two shackles or sling eyes in a hook, what is the suggested maximum included lifting angle?

• A. 120°
• B. 90°
• C. 45°
• D. 180°

Answer: (B)

When two sling legs meet in a hook, the angle between them directly affects how much tension each leg must carry. The larger that included angle, the higher the tension in each leg for the same load. Keeping that angle at or below 90 degrees helps ensure the load is shared safely between the two legs and stays within the rated capacities of the slings and hook. At 90 degrees, each leg carries less than the total load (about 70%), which is a safe, common operating point. If the angle exceeds 90 degrees, tensions rise quickly, increasing the risk of overload or instability. So the suggested maximum is 90 degrees.

When two sling legs meet in a hook, the angle between them directly affects how much tension each leg must carry. The larger that included angle, the higher the tension in each leg for the same load. Keeping that angle at or below 90 degrees helps ensure the load is shared safely between the two legs and stays within the rated capacities of the slings and hook. At 90 degrees, each leg carries less than the total load (about 70%), which is a safe, common operating point. If the angle exceeds 90 degrees, tensions rise quickly, increasing the risk of overload or instability. So the suggested maximum is 90 degrees.