The double row ball slewing bearing has two row steel balls for structure, it has bigger load capacity comparing to single row type slewing bearing   and better safety factor, and it could bear axial load, radial load and tilting moment at the same time. Double row ball slewing Double Row Ball Slewing Ring Bearing ring has three seat rings, the steel ball and the spacing block can be directly arranged into the upper and lower races, two rows of upper and lower steel balls with differently diameter are fitted according to the stress condition. Double row different ball slewing bearing ring’s axial and radial size are relatively large and solid in structure, so it is usually used in diameter tower cranes, truck mounted cranes etc.Double row ball slewing bearing ring is mainly made of 50Mn, 42CrMo, C45.

Thedouble row ball slewing bearing consists of a inner ring, outer ring, balls in double rows, spacers, sealing device, and other KOYO 6304 Bearing components. Due to the top ball mainly taking the axial load and tilting moment loads, the size of top balls are larger than the drop ball. In order to accommodate the various working condition at different axial load, tilting moments and axial load, the angle of contact would be adjusted accordingly.