Eye Bolts & Ring Bolts

What Are Eye Bolts & Ring Bolts?

Eye bolts and ring bolts are among the most fundamental pieces of hardware used across automotive, marine, industrial, and general maintenance applications. Eye bolts consist of a threaded shank on one end and a closed circular loop — the "eye" — on the other. That loop becomes a fixed anchor point to which ropes, cables, chains, hooks, and other rigging components can be attached securely. Ring bolts take the concept one step further: they feature a captive, articulating ring threaded through the eye, allowing the ring to rotate in at least one axis. This rotation helps reduce bending forces on the bolt under load and lets the ring lie flat when not in use — a major advantage in tight spaces.

Types of Eye Bolts: Knowing the Difference

Not all eye bolts are created equal, and choosing the right type for your application is critical for both safety and performance. The two primary construction methods are forged and formed-and-bent. Forged eye bolts are hammered or pressed into shape, making them significantly stronger and capable of handling loads up to the tensile strength of their material — ideal for heavy-duty lifting and rigging. Formed-and-bent eye bolts, by contrast, are suited only to lighter-duty tasks, as an overload can cause the loop to deform or open.

• Plain (Regular) Eye Bolts: Designed for straight vertical loads only. Adding angular pull to a non-shouldered eye bolt can cause it to bend or fail.
• Shoulder Eye Bolts: Feature a raised collar below the eye that distributes angular loads more safely, making them the right choice when a load must be lifted or pulled at an angle.
• Machinery Eye Bolts: Fully threaded and designed to be screwed directly into equipment — no nut required — for heavy-duty, repeatable lifting setups.
• Lag Eye Bolts (Screw Eyes): Feature a wood-screw point for direct installation into wood or lag anchors, commonly used in towing, hanging, and cable-routing tasks.
• Ring Bolts: Include a loose, pivoting ring ideal for applications like dock tie-offs, trailer anchor points, and marine securing where load direction may shift.

Key Considerations When Shopping

Every eye bolt carries a Working Load Limit (WLL) — the maximum weight it can safely support under straight vertical pull. It's essential to match the WLL to your actual application and account for any angular loads, which can dramatically reduce safe capacity. Material matters too: standard carbon steel is common for general use, while stainless steel — especially marine-grade Type 316 — offers superior corrosion resistance for outdoor, marine, and high-moisture environments. Always inspect threads and the receiving hole before installation, and ensure shoulder-type bolts are fully seated before applying any load.

Top Brands in Eye Bolts & Ring Bolts

For general hardware applications, Chicago Brand is a go-to source, offering a broad range of eye bolts and related fasteners built to meet everyday rigging, tie-down, and construction needs. Their extensive selection makes it easy to find the right size and style for both shop and field use.

Boaters and marine enthusiasts will recognize Sea-Dog Line as a trusted name in corrosion-resistant deck and rigging hardware. Sea-Dog's eye bolts and ring bolts are engineered specifically for the demands of saltwater environments, making them a natural fit for dock hardware, anchor points, and onboard securing applications.