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below are definitions of each. think about it this way... a ball bearing is just a small, round ,metal ball. It's usually installed into some sort of assembly that's made to go around in circles. your wheels bolt into a hub that is maintained by a wheel bearing and as you know it goes round and round. bicycle wheels, electric motors like drills and saws, fans. most anything that goes in circles all have bearing Assembly's that contain ball bearings

a ball joint is something that's made to rotate side to side, and back and forth but is stationary. think about shoulder joint. there is a round ball that fits into a socket. a ball joint is identical in function. you can move and rotate your arm but it doesn't go in circles, it just pivots.

Ball bearing - n. (Abbr. bb)

  1. A friction-reducing bearing consisting essentially of a ring-shaped track containing freely revolving hard metal balls against which a rotating shaft or other part turns.
  2. A hard ball used in such a bearing.

Ball joint - 1.Flexible coupling in a vehicle's suspension that connects the control arm to the steering knuckle. A ball joint is so named because of its ball-and-socket construction. Some are designed to never require grease while others should be lubed every six months. As the joint wears, it becomes loose. ...

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