Slings must be removed from service if hooks are twisted more than what angle from the plane of the unbent hook?

Slings must be removed from service if hooks are twisted more than 10 degrees from the plane of the unbent hook. This standard is in place to prevent accidents that may occur due to improper loading and potential failure of the sling system. When hooks become twisted, their load-bearing capacity is compromised, which can lead to slippage, deformation, or even breakage during lifting operations.

Maintaining the integrity of lifting equipment is crucial for safety, and being vigilant about the condition of hooks helps ensure that they can perform as intended under load. The 10-degree threshold is a recognized limit that contributes to safe operational practices in crane operation and rigging. Adhering to this guideline reinforces the overall safety of lifting operations and supports compliance with industry standards.