Slewing Bearing is a large-sized  bearing with special structure which can sustain the compresive  heavy loadings ,like radial loading ,axial loading and tangible moment.In the most cases,because  of its mounting holes ,grease holes and sealing device ,they can fullfill the different requirments of any main frame in all kinds of working conditions.In other hands,slewing bearing which have the characteristic of cramped construction,convinent rotary guide, handy installation and easy maintain are widely used in elevating machinery,  harbor machinery, mine machinery,constructional engineering machinery ,missile launcher and other large-sized rotators.