This ball bearing supports a rotating shaft within the host machine, maintaining radial and axial alignment under load. It sits between the shaft journal and the housing bore, reducing friction between the rotating and stationary components. A worn bearing produces audible noise, shaft wobble, or increased operating temperature as the rolling elements degrade. The manufacturer machines the races to the same internal clearance as the original assembly, preserving the designed load distribution without requiring shimming. On installation, press the bearing onto the shaft using the inner race face and into the housing using the outer race face to avoid brinelling the raceways.