The latest international design, it uses symmetrical spherical rollers, two pieces of quenched steel stamping cage, inner ring without ribs and with a middle retaining ring guided by the cage.
The middle retaining ring close to the outer ring can improve the lubrication of the contact between the end face of the roller and the retaining ring.

Its function is to reduce bearing friction, help guide the roller in the non-load area, and assist the roller to enter the load area while rolling The length of the sub is increased, so the rated load has been greatly improved. Usually the rated load can be increased by 20% to 35%.