A ball bearing is an important motor component that uses balls to maintain the separation between the bearing races.

The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.

There are several common classifications of ball bearing, angular contact ball bearing, deep-groove radial bearing,

axial ball bearing, Conrad-style ball bearing, Self-aligning ball bearings, single-row bearings and double-row bearings, slot-fill radial bearing etc. 


Factors to Consider
In the majority of applications, the use of a standard bearing is the most effective choice. 
Dimensional size
Material type
Lubrication
Enclosures
Cage style (retainer)
Quality requirements