Ball joints are spherical bearings that connect the control arms to the steering knuckles.ball joint is used for allowing three rotations. It fixes the three possible translations (X,Y,Z).
Ball joints are the pivot between the wheels and the suspension of an automobile. Ball joints play a critical role in the safe operation of an automobile's steering and suspension. Ball joints can also be found in most linkage systems for motion control applications, and should not be confused with spherical rod end bearings, which are a different design.
More specifically, a ball joint is a steel bearing stud and socket enclosed in a steel casing. The bearing stud is tapered and threaded. It fits into a tapered hole in the steering knuckle. A protective encasing prevents dirt from getting into the joint assembly. Motion control ball joints tend to be retained with an internal spring, which helps to prevent vibration problems in the linkage.
MaintenanceSealed ball joints do not require lubrication as they are "lubed for life" but standard ball joints must be lubed from time to time. It is best to inspect standard ball joints once a year.
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