Conveyor chains are typically roller chains adapted for conveying duties by adding various application specific attachments. Chain conveyors work well with large, wet, or dry material. They are available in steel materials for strong and durability with different lengths. Bearing roller conveyor chains are designed for general conveying applications. This type of conveyor chains incorporate precisely machined cylindrical roller bearings inside the roller. They provide superior performance through increased strength and reduced friction. The free flow series of the chains allow continuous motion and free speed control of objects while providing extra ability to stop or accumulate conveyed items at a work station or other functional location. Bearing bush chains are used for high precise applications. In these systems the chain elongation is caused by sliding friction between the pin and bushing. Chain conveyors are also noisy and require excess maintenance. Many industry sectors use chain conveyor technology in their production lines