Material: Steel C45, black oxide finish. Temperature range from -40°C to +175°C. Maximum speed 4000 rpm. The screws DIN 912 - 12.9 used in all couplings are covered with a layer of polyamide. Thus the bolts do not loosen with vibrations Bore tolerance: +0,051 mm. The torques in the table are maximum values which can only be achieved with perfect mounting and dimensional accuracy of the shaft.