Flexible coupling to connect the stepper motor axis and trapezoidal screws. Connector provides the connection between the hubs flexible, electrically isolates the connected components and eliminates misalignment.The coupling consists of three parts.Two hub and switch. Hub 5 mm has a hole 5 mm on the motor shaft and the diameter of 26 mm and a length of 18,5 mm. Mounting of the axle with two screws. The hub 10 mm has a hole 10 mm on the trapezoidal screw and the diameter of 26 mm and length of 18,5 mm. .Mounting screw two screws. Connector having a thickness of 9 mm at 0,5 mm protrusions inserted between the clutch hub. Overall length is 30 mm clutch.