Step Motors unipolar and bipolar step motors Vexta PX243M-01AA NEMA 17 - SIZE 42mm 0.9deg / 400 steps/revolution Product Description NEMA 17 - SIZE 42mm 0.9deg, 400 steps per revolution in Full Step Mode. Manufactured by Oriental Motor CO, Ltd. It offers 30 oz-in of holding torque in small NEMA 17 frame. Sigle, round shaft, long enough for easy mounting of any flexible coupling. Works great with BSD-01C, BSD-01v2 and BSD-01P drivers in any microstep mode.