The tensioner is a commonly used holding device on the belt and chain transmission system. It is characterized by keeping the belt and chain with proper tension during transmission, so as to avoid belt slipping or dragging out of the Timing belt due to tooth skipping and tooth detachment.

Alternatively, it can prevent the chain from loosening or falling off, reducing the wear of sprockets and chains. Tensioners have a variety of structures, size and color can be customized.