The rollers type of cylindrical roller bearing, with a larger load capacity and rigidity than the point contact of angular contact bearing, belongs to line contact. It usually conducts by the two ribs of bearing ring. The rollers and the conducted bearing rings combined with one unit. Then the unit can be separated from another bearing rings. It is called separate bearing. The mounting and dismounting are comparatively convenient. It can relatively install inner ring and outer ring. Especially when the interference fit between inner and outer ring ,axis and shell are required ,its advantage can be easily presented. This kind of bearing usually can be used to rely on radial load (it need special custom-made if they are required to sustain axial load) . Comparing to the same dimension s of deep groove bearing ,cylindrical bearing has more heavier capacity to sustain radial load . Its limit speed rating is access to deep groove bearing . The cylindrical roller bearing produced by PRS including five products series, single-row ,double-row ,four-row and such regular types .At the same time we can provide special type to develop and manufacturer according to customers?requirements.