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--Type of Slewing Bearing 0- ball Slewing Bearing 1- roller Slewing Bearing -Structure type of raceway 1-Single-Row Crossed Roller Type,Single-Row Four Point Contact Ball Type 2-Double-Row Different Ball Type 3-Three-Row Roller Type CHARACTERISTIC OF STRUCTURE£¬PERFORMANCE AND APPLICATION The single-row four point contact ball slewing ring is composed of 2 seat-rings.It features compact in design,and light in weight.The balls contact with the circular race at four points,via which the axial force,radial force and resultant moment may be born simultaneously. It may be used for slewing conveyers,welding arm and positioner,light,medium duty cranes,excavators and other engineering machines. Choose the type of slewing bearing, please refer to "Selection of the calculation" Installat the slewing bearing, please refer to "Installmeat and maintain instruction" The specifications of the catalogue are all standard product, inner/outer ring and the machine have the mating rabbet requirement,please give clear indication in the contract. If need the non-standard products, please contact with our company at any time.