In an automobile, ball joints are spherical bearings that connect the control arms to the steering knuckles.
A ball joint consists of a bearing stud and socket enclosed in a casing. The bearing stud is tapered and threaded, and fits into a tapered hole in the steering knuckle. Usually, this is a rubber-like boot that allows movement and expansion of lubricant. Motion-control ball joints tend to be retained with an internal spring, which helps to prevent vibration problems in the linkage.
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