In certain circumstances，FAG bearings
should be imposed preload to increase rigidity. This process is typically used in inner ring offset and shaft bending for deep groove ball bearings
, angular contact ball bearing
and tapered roller bearing
, and tolerances change of FAG bearing box. Any errors will cause the eccentricity of the inner and outer rings. Automatic aligning ball bearings, auto-aligning roller bearings and aligning bearing is a better choice in preventing the eccentric angle too large. The rolling bearings are produced by high-precision standard，so the voice and torque are small. Deep groove ball bearings and cylindrical roller bearings
are suitable for some occasions that required low voice and torque.