Which type of eye bolt should not be used for angular lifting?

The shoulderless eye bolt is not designed for angular lifting because it lacks the necessary structural support and stability that shoulder design provides. When lifting at an angle, the load can create uneven stresses on the bolt, which may lead to deformation or failure. Shoulderless eye bolts are generally intended for vertical lifting only, where the forces are directly aligned with the bolt axis.

In contrast, both shouldered eye bolts and swivel hoist rings are specifically engineered to handle angular loads effectively. The shoulder on the bolt provides a seat for the load, distributing the stress more evenly and reducing the risk of failure. Likewise, a swivel hoist ring allows for rotational movement, accommodating shifts in load direction without compromising safety.

An eye bolt with nut can also be secure for lifting applications, but like the shouldered eye bolt, it is primarily suitable for vertical lifting as well unless specifically designed to permit angular lifting. Using an eye bolt that is not rated for angular lifting can lead to hazardous situations and equipment failure, emphasizing the importance of choosing the correct type of eye bolt based on the lifting conditions.