From the sides with a sealed ball bearings and cast outside the sphere (or steel stamping) bearing component. Insert ball bearings deep groove ball bearings with the internal structure of the same, but such a cut spherical bearing outer ring outer surface, and concave spherical bearing matched automatically aligning with the top wire is usually of such bearings, eccentric sleeve, or adapter set the bearing inner ring secured to the shaft and rotating together with the shaft bearing with seat compact assembly and disassembly, applicable to simple bearing, commonly used in mining, metallurgy, agriculture, chemical, transportation and other machinery.