Today I learned : Eye Bolts

While conversing with the team leader about the construction of buildings, he mentioned the use of eye bolts for lifting purposes.

What is an Eye Bolt:

Eye bolt is a type of bolt that contains a loop or eye at one end and threaded shank at the other end with or without shoulder between them. They are designed to be used as secure connection point in lifting systems. The threaded shank is anchored into the metal surface and the eye or loop is attached with ropes, cables or other rigging.

Types of Eye Bolts:

1.Regular Eye bolts:

Simplest type of eye bolt featuring a loop and a threaded shank without any additional features. They are suitable for vertical lifting applications with minimal to none angular forces.

2.Shoulder Eye Bolts:

Shoulder eye have a shoulder below the eye which provides extra support. This shoulder prevents the bolts from deformation or bending under angular loads.

3.Swivel Eye Bolts:

Swivel eye bolts feature a swivel mechanism between the eye and the threaded shank, allowing for rotation. This minimizes the chances of twisting and potential harm to lifting gear, rendering it well-suited for situations demanding adaptability.

4.Lag Eye Bolts:

Although called a lag eye bolt, it is essentially a screw with an eye and threaded shank. They are specifically designed for wood and is directly screwed into the wood. Its load capacity depends upon the wood’s type and condition.

5.Machinery Eye Bolts:

These bolts are specifically designed to use in machinery. These have a short shank length and large eye diameter. These bolts are often used as permanent lifting points in machinery.

Applications of Eye Bolts:

• Construction: Utilized in lifting materials, securing scaffolds, and suspending equipment and fixtures at construction locations.
• Manufacturing: Engaged in lifting heavy machinery, positioning molds and dies, and managing raw materials within manufacturing plants.
• Entertainment and Events: Deployed in stage rigging, lighting setups, and suspending props and scenery for concerts, theatrical productions, and events.
• Marine: Crucial for anchoring cargo, rigging sails, and securing equipment on ships and offshore platforms.
• Transportation: Utilized for securing cargo during transit.

Sources :

What Are The Different Types of Eye Bolts Used for Overhead Lifts? » Mazzella Companies

Eye Bolts: The Essential Lifting Hardware (e-rigging.com)