Eye bolts are a versatile type of hardware that can be used for a variety of lifting and rigging applications. They are made up of a threaded shank with a loop or eye at one end, and they can be attached to a variety of materials, including wood, steel, and concrete.
There are four main styles of eye bolts:

Regular Eye Bolts
These fittings feature a threaded shank and a loop or eye at one end. For installation, the eye bolt is passed through a hole and fixed on the reverse side using a nut. It is important to note that regular eye bolts have a designated working load limit, which must be accounted for when employing them to lift or support overhead loads. Additionally, they are engineered exclusively for straight-line loading and may bend or fracture if subjected to angular loads.
Shoulder Eye Bolts
Shoulder eye bolts incorporate a supportive shoulder that permits angular loading when correctly mounted. These versatile components are installed by passing them through a pre-drilled hole and fastening them from the opposite side with an integral nut. In applications involving overhead lifting or load support, their specified working load limit must be strictly observed.
Lag Eye Bolts
Lag eye bolts feature threads tailored for direct insertion into wooden substrates. Their load-bearing capacity is not assigned a fixed working limit, as it fundamentally depends on the wood's characteristics—such as species and structural condition. For instance, these fixtures exhibit higher load tolerance when anchored in dense, sound oak lumber compared to aged, weathered pine fence posts.
Machinery Eye Bolts
Machinery eye bolts are employed as dedicated lifting points by being threaded into equipment. Their short, fully threaded shanks enable direct installation into pre-tapped holes. Designed with an integral shoulder, these fittings accommodate angular lifting forces and are rated with a specified working load limit.