Eyebolts

Eyebolts are threaded fasteners with a circular loop at one end and a threaded shank on the opposite side. They provide a point of attachment for ropes, cables, or chains and are commonly used to facilitate lifting, securing, or anchoring loads. They are intended for straight-line pull and must be selected and installed with consideration of load direction, capacity, and material compatibility.

Common configurations include standard eyebolts and shoulder eyebolts. Standard eyebolts have a continuous circular eye and a threaded shank; shoulder eyebolts incorporate a shoulder where the eye and shank meet, providing a bearing surface to resist bending and to help maintain thread engagement under load. There are also safety eyebolts designed for controlled, straight-line lifting and warning against side loading.

Eyebolt materials range from carbon steel to stainless steel and alloy steels, with finishes such as zinc plating or hot-dip galvanizing for corrosion resistance. The choice depends on environment, including moisture, chemicals, and load requirements. Some eyebolts are rated for lift applications and carry certification labels or manufacturer load ratings.

Installation involves threading the shank into a tapped hole or using a clevis or nut to secure. The load must be applied along the bolt axis and through the center of the eye; side or angular loads can cause catastrophic failure and should be avoided. Use only eyebolts rated for the intended lift, adhere to the specified load rating, and check for wear, deformation, or cracks before use. Do not reuse damaged parts.

Standards and rating systems vary by region; consult manufacturer specifications and applicable safety standards. Regular inspection and replacement of damaged components are essential to safe operation.

See also: lifting equipment, anchor point, shackles, rope and rigging basics.