Product features:
Single row four point contact ball slewing bearings consist of a one-piece inner and outer ring and a set of spacers, protected by integral seals. The balls are inserted into the bearings via a hole in one of the two rings and are separated by polyamide spacers. After loading the ball set and spacers, the hole is closed with a plug that conforms to the race-way contour. 
 The single row four-point contact ball slewing bearings is divided into three series:

1. Light series four-point contact ball slewing bearings 

2. Medium size four-point contact ball slewing bearings

3. Customized four-point contact ball slewing bearings

 
  RKS.062.20.0544 four point contact slewing bearing with internal gear teeth
 
Advantage:  RKS.062.20.0544 four point contact slewing bearing with internal gear teeth, it features compact in design, light in weight, high precision and small fitting clearance. As the rollers are 1:1cross arranged, it is suitable for high precision mounting and capable to bear axial force, resultant moment and considerable large radial force. The four point contact slewing bearing find widely application for transporting, engineering machines as well as for military products.
The three-row roller slewing bearing has three seat-rings,which separate the upper,lower and radial races,via which the load of each row of the rollers may be specified.It may bear different loads simultaneously and its load capacity is the largest one among the four models. 
Thanks to the large size of its axle and radius,it is sturdy and especially suitable for heavy-duty machines which require large working radius.such a bucket  wheel  excavators , wheeled cranes, ship cranes, ladle turrets,heavy duty mobile cranes etc.