Ball Joint
Common name for ball-and-socket joints used on
steering arm ends and
suspension components where two-directional movement is required between joined components. The ball joint consists of a shaft terminating in a ball which fits into a cup to give a wide area of movement. Once lubricated by grease or heavy oil, ball joints are now made with a mixture of plastic and metal, or with a plastic liner, eliminating the need for
lubrication.