SCA2018 – Stepper motor with hollow shaft – NEMA 8 Description Technical data High-torque stepper motor with NEMA 8 flange (20 mm) and 1.8° step angle. The SCA2018 series comes with a second shaft end for mounting an encoder. Size NEMA 8 Holding Torque Resolution 1.8 °/step
SCA2818 – Stepper motor with hollow shaft – NEMA 11 Description Technical data High-torque stepper motor with NEMA 11 flange (28 mm) and 1.8° step angle. The SCA2818 series comes with a second shaft end for mounting an encoder. Size NEMA 11 Holding Torque Resolution 1.8 °/step
SCA4218 – Stepper motor with hollow shaft – NEMA 17 Description Technical data High-torque stepper motor with NEMA 17 flange (42 mm) and 1.8° step angle. The SCA4218 series comes with a second shaft end for mounting an encoder. Size NEMA 17 Holding Torque  - Resolution 1.8 °/step
SCA5618 – Stepper motor with hollow shaft – NEMA 23 Description Technical data High-torque stepper motor with NEMA 23 flange (56 mm) and 1.8° step angle. The SCA5618 series comes with a second shaft end for mounting an encoder. Size NEMA 23 Holding Torque  - Resolution 1.8 °/step
ST4118 – Stepper motor with hollow shaft – NEMA 17 Description Technical data High-torque stepper motor with hollow shaft in size NEMA 17 (42 mm) and with 1.8° step angle (full step). Available in various lengths and versions. Size NEMA 17 Holding Torque Resolution 1.8 °/step