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The latest version NEMA 17 step motor with holding torque of 140mN.m. Free 2.3ft length jump wire and XH motor cable with a 4-pin 0.1 inch pitch (2.54mm) connector already fitted - ready to plug and print! It is ideal for the RepRap Prusa, Mendel 90, Rostock and similar 3D printers, as well as CNC and robotics applications. Electrical Specification:Motor Type: Bipolar StepperPhase: 2Rated Voltage:3.6VRated Current: 1.2AInductance:2.7mH +/- 20%(1KHz)Holding Torque:?140mN.mElectric Resistance:2ohms +/-10% Physical Specification:Frame Size: 42 x 42mmBody Length: 30mmShaft Diameter: 5mmShaft Length: 16mmNumber of Leads: 4Weight: 181g Wire Connection:Black(A+), Green(A-), Red(B+), Blue(B-) WARNING:As a stepper motor, it should connect to a constant current or chopper driver. Connecting the motor directly to a power supply will destroy the motor.To choose a driver, please make sure the driver output current not higher than motor rated current, and voltage not higher than 36V.Please take care of wires coils order when you connecting to driver or it will damage your driver.