... many Engineering Machinery,for example,Slewing Conveyer,Welding Operation Machine,Pint-size&Medium-sized Crane,and so on 2. Double-Row Ball ... biggest among four models,one more thing,the axial&radial size are rather large to some extent and the structure is ... many Engineering Machinery,for example,Slewing Conveyer,Welding Operation Machine,Pint-size&Medium-sized Crane,and so on.6. Single-Row Crossed ...