Very High Torque NEMA 17 bipolar 1.65 inch x1.65 inch x2.36 inch 4-wire This is one of strongest bipolar Nema 17 stepper motor with 1.8 . step angle (200 steps/revolution). Each phase draws 2.1A, allowing for a holding torque up to 65Ncm(92oz.in). Electrical Specification: Motor Type: Bipolar Stepper Step Angle: 1.8 . Holding Torque: 65Ncm(92oz.in) Rated Current/phase: 2.1A Phase Resistance: 1.6ohms Inductance: 3mH+/-20%(1KHz) Physical Specification: Frame Size: 42 x 42mm Body Length: 60mm Shaft Diameter: 5mm Shaft Length: 24mm D-cut Length: 15mm Number of Leads: 4 Lead Length: 500mm Weight: 500g Colour: Black material: metal Connection: Black(A+), Green(A-), Red(B+), Blue(B-) Warning: Make sure the motor connect to a constant current or chopper drive controller before you test motor. Connecting the motor directly to a power supply will the motor. Package Contents: 1 * 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.