Plain bearing is a spherical sliding bearing, its sliding contact surface is an inner sphere and an outer sphere, which can rotate and swing at any Angle when moving, it is made of surface phosphating, blasting, insert pad, spraying, other special process processing methods. The plain bearing has the characteristics of large load capacity, impact resistance, corrosion resistance, wear resistance, self-aligning, good lubrication and so on.

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Rod end bearing is a joint bearing with a rod end or mounted roa end on the plain bearing, which is a class of plain bearings. Since the outer sphere of the inner ring is inlaid with composite material, the bearing can be self-lubricating in operation. Generally used for low speed swing movement, could also be tilted in a certain Angle range, when the supporting shaft and shaft shell hole concentricity is large, it can still work normally. Self-lubricating joint auxiliary should be used in water conservancy, professional machinery and other industries.

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Accessories with sealing, wear protection and other functions. Bushing is used outside the mechanical parts to achieve sealing, wear protection and other functions of the accessories, which refers to the ring sleeve that plays the role of the liner. In the field of valve application, the bushing is inside the valve cover, and corrosion resistant materials such as polytetrafluoroethylene or graphite are generally used for sealing.​