Theoretically, bearing in safe operating condition, when slightly negative operating clearance, bearing lifetime maximum. But actually to maintain this optimal state is very difficult to change once certain conditions of use, the negative clearance increases, which could cause significant degradation or heat bearing life. Therefore, often choose the early clearance required clearance operation is taken to only slightly greater than zero.
 
        For bearings under normal conditions of use, will be used with ordinary load, speed and temperature is normal, simply select the appropriate ordinary clearance to make available appropriate operating clearance.
 
        Examples clearance applies very common
Conditions of Use
Applications
Selection clearance
 
Withstand heavy shock loads, large amount of interference
Railway vehicle axle
C3
 
Shaker
C3, C4
 
Bear no directional load, inner and outer rings are used with static
Railway vehicle traction motors
C4
 
Tractor final reducer
C4
 
Bearing or inner heat
Papermaking machines, dryers
C3, C4
 
Roller mill Kun
C3
 
Reduce rotational vibration and noise
Micromotors
C2
 
Adjustment clearance and vibration control shaft
Spindle (double row cylindrical roller bearings)
C9NA, C0NA