Cross cylindrical roller bearings, the use of cross-distribution of cylindrical roller bearings realize rolling elements and raceways line contact, high rigidity and high precision bearing swivel rotation, while the axial and radial overturning moment. Used for precision machine tools, precision rotary tables, medical equipment and industrial robots, palletizing machines, precision, high rigidity arm stacking work requires high precision turning and other fields. The use of an optimized preload, such bearings with high rigidity, stiffness and precision turntable thus also guaranteed. Thanks to the two rows of cross-roller design, effective span of the bearing can be significantly improved, so kind of bearing has high resistance to overturning moment. Cross roller bearings, is divided into two types: the first one is a cylindrical cross roller bearings, and the second is a tapered cross roller bearings. Typically, the cylindrical cross-tapered roller bearings prices low cross roller bearings for a relatively low speed turntable applications; and tapered roller bearings with a cross-tapered roller rolling pure design, with high running accuracy, speed capability strong, reducing the length of the shaft and processing costs and other advantages. Crossed roller bearings are suitable for all types of vertical or horizontal boring machine, as well as vertical mill, vertical lathe and a large gear milling applications.