Eye Bolt And Eye Nut

An "eye bolt" and "eye nut" are two related hardware components commonly used for lifting, rigging, and securing applications. They usually are made of forged carbon steel or stainless steel. They both feature an "eye" (loop) at one end for attachment purposes, but they serve different functions.

An eye bolt is a threaded fastener with a closed-loop (eye) at one end.

An eye nuts are threaded fasteners with a looped head that can be affixed to a stud or bolt.