・ The interface radius of the channel located on the inner and outer ring is slightly larger than the radius of the sphere, in arc shape. Mainly can bear radial load.
・ In addition to the open type Ball Bearings, there are bearings with steel dust cover, bearings with contact rubber seal packing and bearings with non-contact       rubber seal packing, or bearings with stop ring on the outer diameter of outer ring.
・ Ball Bearings with dust cover or seal packing are sealed with the proper amount of high-quality grease. Deep groove ball bearings generally adopt steel plate     stamped cage, which has low friction torque and accuracy grade of 0.