... 1 PC Nema 42 Stepper Motor with Single shaft 3256oz-in Holding torque, 2 PCS Stepper Driver ... Motor with 1600oz-in holding torque on single shaft, front shaft length is 37mm with 25mm flats length, ... keyway Please tell us if you need Double shaft or single shaft, we can manufacture both for you. If ... you need Double shaft, please tell us your requirements for length of front and rear shaft, as well ...