The original list of deep groove ball bearing is radial ball bearing, which is a widely used rolling bearing. It is characterized by low friction resistance and high speed. It can be used for parts bearing radial load or combined load of radial and axial simultaneously, and can also be used for parts bearing axial load.W 638/4-2RZ bearing can be used for gearbox, instrument, motor, household electric appliance, internal combustion engine, traffic vehicle, agricultural machinery, construction machinery, engineering machinery, roller skates, Yo Yo Yo, etc