The special operation condition requires the articulated bearing dedicated to bale rotary table to be applied together with steel/steel or steel/PTFE (maintenance-free) compound materials. The spherical plain bearing integrating with sliding contact surface may be supplied as needed. Generally, the steel/steel bearing is suitable for the scenario with high operation temperature or high loading frequency or heavy load or impact load. Such bearing must be equipped with sufficient lubricant. And the sliding surface of its outer ring may be furnished with grooves of different shapes.

If it is required to operate the bearing without lubricating, the bearing integrating with maintenance-free steel/PTFE compound sliding contact surface shall be adopted. Such combination can withhold heavy load, especially directed heavy load.