What is a critical limitation of using lifting eyes or eye bolts for rigging?

• A. They are rated for side loading in all directions.
• B. They require complex calculations before use.
• C. They are typically rated for straight vertical lifts; side loading or angular pulls can cause failure; avoid angular lifts unless specifically rated.
• D. They cannot be used with shackles.

Answer: (C)

The key idea is that lifting eyes and eye bolts are built to carry load along their axis, not from the side or at an angle. When the load is straight up, all the force goes through the threaded shank and the eye, so capacity is used as intended. If the pull isn’t aligned—side loading or an angle—the load creates bending and shear on the bolt and its threads, drastically reducing the effective capacity and increasing the risk of failure. Only devices specifically rated for angular loading should be used for lifts with any angle; otherwise, angular lifts must be avoided. If you must lift at an angle, choose hardware rated for that angle or use a different lifting point that keeps the load vertical.