Manufacturer's designation:

305803 C-2Z 

Construction:

Based on double row angular contact ball bearings. The thick-walled outer ring with a crowned working surface prevents edge stresses in case of misalignment. Grease hole in the inner ring allows for easy relubrication. 

Features:

High radial load capacity and relatively high rotational speed.
Adapted to overturning moments.
Possibility of relubrication.