SiCross roller slewing bearing Cross roller slewing bearing is often used in bucket turbine, overweight transport machinery, port machinery, mining machinery, construction machinery and other large rotary device, has played an important role in the operation of construction machinery. Cross roller slewing bearing is composed of two seat rings, compact structure, light weight, high manufacturing accuracy, small assembly clearance, high requirements for installation accuracy, roller 1:1 cross arrangement, can bear axial force overturning moment and larger radial force at the same time.