Sherlne 67126 High-Torque Stepper Motor Sherline high-torque stepper motor has the same NEMA #23 frame as our standard stepper motor, but it has over 75% more torque. The Max “Rapid Feed” will not change. Your cutting feed rate can be increased because you will be using a stepper motor that has higher torque. It is also better suited to handle the additional weight of the motor and headstock on our Z-axis. ATTENTION: This new high-torque stepper motor requires a special CNC coupling (P/N 671052, sold separately). Please see link below for details.