Bearing internal clearance in operation is an important factor that has a significant influence on other factors such as noise, vibration, heat and fatigue life. The radial play in the bearing before it is fitted can be called the initial radial play. Residual or operational radial play is what is left when the bearing has been fitted. There should be a slight residual radial play in the bearing to minimize ball skidding and reduce axial play(end play). Correct selection of the initial radial play can avoid faster bearing wear.