Description Stepper motors are different from DC motors in that they have to be pulsed to move in set increments. That means you can't simply hook them up to a power supply to make them go, but they have other advantages, like accurate positioning (1 pulse=1 increment of movement), and lots of low-speed torque (ability to twist things). This 4-wire bipolar stepper has 1.8° per step for smooth motion and a nice holding torque. This NEMA-17 stepper motor produces a whopping 4800g*cm (66.7in*oz) of holding torque. Applications: stage lighting, laboratory instruments, textile machinery, telescope positioning, robotics, etc. Pinout * Black wire =A * Green wire = B * Red Wire = C * Blue wire = D Features * Very High Torque * NEMA-17 Bipolar 4-wire * Step angle: 1.8 degree * Holding Torque: 4800g-cm@2.5 Amps Specification * Number of steps: 200 Step * angle: 1.8 degrees * Rated Voltage: 3.1V * Phase Resistance: 1.25 ohm * Rated Current : 2.5 A * Phase Inductance : 1.8 mH * Holding torque: 4.8 kg.cm * Number of Leads: 4 * Dimensions axis: Ø5 x 22 mm * Dimensions: 42 x 42 x 48 mm * Weight: 340 g Document * 42BYGHW811 datasheet https://elecena.pl/product/5235806/silnik-krokowy-nema-17-bipolar-48mm 2015-07-11 https://elecena.pl/product/5235806/silnik-krokowy-nema-17-bipolar-48mm 2015-09-07 https://elecena.pl/product/5235806/silnik-krokowy-nema-17-bipolar-48mm 2017-10-29