Luoyang Zhuanpan Slewing Ring Co., Ltd .ï¼?LYZPï¼?, is a manufacturer specialized in producing and selling extra large bearings ( diameter from 400mm to 5000mm ) , slewing bearing as well as non- standard special bearings . Single row four point contact ball slewing bearing Single row crossed roller slewing bearing Double row ball slewing bearing Three row roller slewing bearing Application : widely used in wind-power equipments , metallurgical and mining equipments , off-shore equipments , construction machinery engineering machinery , etc .