The single-row crossed roller Slewing Bearing is composed of two seat-rings.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 single-row crossed roller Slewing Bearings are widely used for hoisting,transporting,engineering machines as well as for military products.