Swivels

A swivel is a mechanical joint that allows rotation about a single axis while supporting a load. It consists of two main parts connected by a bearing: a stationary component such as a yoke or eye, and a rotating component such as an eye, hook, or link. The bearing reduces friction and wear, enabling the attached line, cable, chain, or rod to rotate freely and prevent twisting.

Common types include ball-bearing swivels, which use ball bearings for low friction; roller-bearing swivels, which use rollers; chain swivels used with chain connections; hook swivels with a swiveling hook; eye swivels used to connect to other links; and safety or locking swivels that incorporate a latch or gate to prevent accidental disconnect. Design variations address different load, rotation, and attachment requirements.

Materials vary by application and environment. Stainless steel offers corrosion resistance, carbon steel provides high strength with protective coatings, aluminum is favored for light weight, and brass appears in some marine or decorative uses. Ratings are presented as working load limit or capacity and should match the accompanying hardware's specifications.

Applications span marine rigging, cranes and hoists, fishing gear to prevent line twist, theater rigging, and certain medical or camera mounting systems. In rigging, a swivel allows components to rotate to avoid twisting lines; in lifting, it enables swiveling of shackles and hooks under load.

Maintenance involves regular inspection for wear, corrosion, cracks, and deformation. Bearings should be lubricated according to manufacturer instructions, and swivels should be replaced if there are signs of poor performance or safety concerns. Overloading or improper use can lead to failure or unexpected rotation.