Material: Steel C45 burnished. 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. Feather Key Groove DIN 6885/1, Tolerance P9. The torques in the table are maximum values which can only be achieved with perfect mounting and dimensional accuracy of the shaft.