... part: polyurethane 4 pieces. * M: The hole dia. Of the encoder end. N: The hole dia. Of the user end. * D and ... . * Diameter of hollow shaft can be defined by user; Standard hole 4mm, 5mm. 6mm, 6.35mm, 8mm, 10mmm 12mm. * Torque <35 ... .Φ4,Φ5,Φ6,Φ8,Φ10,Φ12,Φ15mmN: the hole dia.of the user end.Φ4,Φ5,Φ6,Φ6.35,Φ7,Φ8,Φ10,Φ12,Φ15mmTorque ...