Usage Tips:Description This is an updated version nema 17 stepper motor with holding torque of 59Ncm(83.6oz.in). It's good for 3D printers, as well as CNC and robotics applications. Electrical Specification: - Manufacturer Part Number: 17HS19-2004S1- Motor Type: Bipolar Stepper- Step Angle: 1.8 deg.- Holding Torque: 59Ncm(83.6oz.in)- Rated Current/phase: 2.0A- Phase Resistance: 1.4ohms- Inductance: 3.0mH+/-20%(1KHz) Physical Specification: - Frame Size: 42 x 42mm- Body Length: 48mm- Shaft Diameter: 5mm- Shaft Length: 24mm- D-cut Length: 15mm- Number of Leads: 4- Lead Length: 1m.- Weight: 390g Connection: Black(A+), Green(A-), Red(B+), Blue(B-) Warning: Connecting the motor directly to a power supply will destroy the motor.Packing list: 1 * Nema 17 Stepper Motor Bipolar 2A 59Ncm(84oz.in) 48mm Body 4-lead for 3D Printer/CNC