The Largest Model Among SERVO FLEX : Metal Disk Couplings The maximum flange outer diameter is ø 262 mm and the permissible torque is 8000 N· m. The most rigid S type has a torsional stiffness of 10, 780, 000 N· m/ rad at maximum. This series is available with the high-flexibility G type, where a high-rigidity single-element S type and two elements are positioned respectively and are jointed with a floating shaft at the middle part. This is also available for length setting according to customers