Single-row crossed cylindrical roller slewing bearing is similar to four-point contact ball slewing bearing, with only single-row short cylindrical rollers. The axes line of adjacent cylindrical is 90° crossed spread. There are two raceways in outer and inner ring. The section of raceway is linear. Half of the rollers bear down axial loading and half bear up axial loading. So a crossed roller bearing can bear radial loading, axial loading and moment loading, loading from all directions. Single-row crossed cylindrical roller slewing bearing is widely used in joint parts and rotating parts of robots, revolving table of machinery process center, machinery hand revolving part, medical equipments, crane transportation machinery, engineering machinery and army products.