Material: Steel, with double-strand chain DIN ISO 606 (ex DIN 8187). The couplings are delivered unassembled. The chain is packed seperately. Number of teeth = 18. -Elastic transmission of torque. -Fast declutching by simply loosening the chain. -Shafts do not need to be exactly aligned. -No axial shaft clearance permissible. Temperature range: -30°C to +220°C. *Selection according to the ratio of driving power to speed (P/n), the nominal torque must not be exceeded (incl. operating factor).