Nuts and bolts are common fasteners that are used to secure or fasten materials together. Depending on the purpose and use, there are different types of bolts that are classified according to their distinct head shapes, strengths, finish and material used. Having an understanding of the variety of bolts available is important so as to choose the right bolt for specific application purposes and for effective results.
Among the many varieties of anchor bolt, Eye Bolt is the type of threaded fasteners, with a loop at the end. The threaded feature allows them to be driven into pivot holes. Eye bolts do not have a characteristic soil head, instead have a loop that resembles an eye, which is why the name; eye bolt.
Eye bolts are used in various fastening applications, to firmly attach or tie ropes and cables, to lift or suspend a load. You can find different eye bolt sizes and a variety of eye bolt types available in the market to suit different uses and purposes.
To learn more about eye bolt uses and varieties available, read this blog.
Type of Eye Bolt Fasteners
There are mainly four eye bolt types that are available in a range of sizes and material finish, namely; Standard or forged eye bolts, shouldered eye bolts, regular or nut eye bolts, and machinery eye bolts.
- Forged eye bolts: These bolts are hammered and pressed to form the shape of a forged eye, making them stronger, harder, and more durable. As a result of their shape, Forged eye bolts are recommended for heavy-duty lifting applications since they can withstand loads up to the tensile strength of the material they’re made of. They are available in larger sizes to suit a variety of purposes and requirements in construction sites.
- Shouldered eye bolt: This eye bolt type incorporates a shoulder at the point where the eye and shank meet, that reduces bending stresses caused during heavy-lifting. The peculiar design of the bolt allows it to be used for in-line or angular lifting. However, one must be careful while using these bolts and ensure that the load is properly seated on the shoulder and does not exceed the working limits. It is always recommended to follow the manufacturer’s specifications and reduce the capacity when loading at different angles.
- Nut eye bolts: These bolts feature a nut at the end of the threaded shank, in which the bottom of the shank protrudes through the load and is secured in place with a nut. They add additional security and safety. There are a variety of variants of nut eye bolts, including those with or without shoulders.
- Machinery eye bolts: The shank of machinery eye bolts is threaded and designed to be installed into tapped holes that have been designed specifically as lifting points. The angular load can be applied to them when they are equipped with a shoulder upto 45°. A machinery eye bolt capacity can be determined by adding half of the diameter of the nominal eye bolt to the basic shank length. It is always advisable to follow the instructions as per the manufacturer’s guide before using.
In addition to these, there are other types of eye bolts that are characterized based on their shape, sizes and based on the material used. Eye bolts are made from a variety of alloys and metals such as aluminum, bronze, stainless steel, titanium and others. Choosing an eye bolt made of the right material is as crucial as choosing an eye bolt type and capacity it can withstand. One must consider the climatic conditions and humidity levels of the site. For best practices, we recommend you to check product details and specifications mentioned by the manufacturer.
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