The 4118S-02D-23RO is a size 4, serially-reversible, two-phase, unipolar, bipolar-type stepping motor from Lin Engineering. This motor has a 1.8° step angle, 0.070” (1.78 mm) per phase, 51.5 O (ohm) phase resistance, and 5.2 A phase current. It has a Holding Torque of 48.5 oz-in (3.45 N-m), and has a recommended voltage of 9 VDC. Its continuous current per phase is 1.81 A. This motor is designed for use in a wide range of applications, such as positioning and micro-stepping systems. It features a round base that provides improved mounting ability and easy wiring.