The rolling element is a centripetal rolling bearing of cylindrical roller. The internal structure of cylindrical roller bearing adopts the parallel arrangement of rollers, and the spacer or spacer block is installed between the rollers, which can prevent the inclination of the roller or the friction between the rollers, and effectively prevent the increase of the rotating torque.

Cylindrical roller and raceway are linear contact bearings with large load capacity and mainly bear radial load. The friction between the rolling element and the ring rib is small, which is suitable for high-speed rotation. According to whether the ring has flange, it can be divided into single row cylindrical roller bearings such as Nu, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing is a separable structure of inner ring and outer ring.

Cylindrical roller bearing without rib in inner ring or outer ring can move relative to axial direction, so it can be used as free end bearing. The cylindrical roller bearing with double rib on one side of inner ring and outer ring and single rib on the other side can bear axial load in one direction to a certain extent. Generally, steel stamping cages or copper alloy turning solid cages are used. But some use polyamide formed cages.