This slewing bearing is comprised of double row steel balls in upper and lower layers,inner ring andouter ring,spacer,lubricating and seal fittings, the inner ring and outer ring are in two separete structures and two half rings need to be fixed by joint bolts. due to the upper and lower rows of steel balls. the bearing can carry radial force,axial force and tilting moment simultaneously.Mostly the bearing is working under axial force and tilting moment together.