Rolling body is cylindrical roller radial rolling bearing. The internal structure of cylindrical roller bearing of the roller was 90 degrees vertical arrangement (which is also the cross roller bearing the name of the origin), interval retainer or isolation block is arranged between the roller and the roller can prevent between tilt or roller friction each other, effectively prevent the increase of rotational torque. Cylindrical roller and rolling line for line contact bearing. Load capacity, mainly to bear the radial load. Ring wall and rolling friction small, suitable for high-speed rotation. According to the ferrule has without ribs, can be divided into NU, NJ, NUP, N, NF and NNU single row cylindrical roller bearings, and NN double row cylindrical roller bearing. The bearing is a separable structure of inner and outer rings.