The SE tensioning arm is the mostly used standard for tensioning all kinds of chain & belt drives. According to application, the tensioner arm is supplemented with the appropriate idler sprocket for chain drives or idler roller for belt drives. (sold separately). The tensioning element is based on the rubber spring principle, its inserts are a high elastic natural rubber with a good shape memory. They also provide effective absorption of vibrations. The unit is designed for applications in a temperature range from -40°C to +80°C.