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With the constant development of material science and physics, bearings are widely used in heavy industry, light industry, mechanics, green industry, etc. Bearings has become the fundamental core for the operation of modern technology.

Categorized by the load direction, bearings can be divided into Radial Bearing (bear radial loads), Thrust Bearing (bear axial loads), Radial-thrust Bearing (bear radial and axial loads). And categorized by the shape of the rolling objects, they are divided into:

Ball Bearing: Its rolling objects are balls in shape, and it has relatively smaller contact areas between the rolling objects and the inner and outer rings, that when it's operating with loads, it has lower friction and bear lower impact.
Roller Bearing: Its rolling objects are cylinders in shape, and it has relatively higher contact areas between the rolling objects and the inner and outer rings, that when it’s operating with loads, it has higher friction and bear higher impact.
Self-lubricating Bearing: It has no rolling objects and its ring directly contacts the loads, so the friction is higher than the both above. It relies on it's own material to lubricates itself or sometimes with somewhat grease.

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