normal style="MARGIN: 0cm 0cm 0pt 21.75pt">single row ball sleiwng bearing , also called single row ball slewing ring , is composed of internal and external seats and features compact in design and light in weight . It can bear axial force , radial force and overturning moment and suitable for machine of 360°, relative rotary motion on single dimension and machine of combined relative rotarry motion in a two or three dimensions space . It is widely used for rotary conveyor machines , welding operation machines , tower cranes , small and medium-sized excavators , engineering and military industrial equipment machines , high-attitude operation trucks , entertainment machines , foundry machines , crane trucks , pile drivers , artial ladder fire-fighting trucks etc .