Middle Size with Hight Torque 18Ncm(25.5oz.in) holding torque NEMA 14 bipolar 1.38inch x 1.38inch x 1.34inch 4-wir 1.8 . step angle(200 steps/) Rated current 0.8A & resistance 6.8ohms Model: 17HS8401 Features: low noise, low heat generation, smooth operation, good acceleration performance Basic parameters of the motor: Step angle: 1.8 Current: 1.7A Resistance: 1.8 ohm Inductance: 3.2mH Static moment: 52N.cm Positioning moment: 2.6N.cm Moment of inertia: 68 Number of leads: 4 Motor weight: 350g Body length: 48mm Adapter driver: two-phase stepper driver 2M420, 2M415 Colour: black+silver Material: metal Size: 48x30mm Package Contents: 1 * 42 Stepper Motor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.