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★Physical Specification:Size:13NcmMotor type: bipolar stepperStep Angle: 1.8 deg.Holding Torque: 13Ncm(18.4oz.in)Rated Current/phase: 1APhase Resistance: 3.5ohmsInductance: 4.5mH+/-20%(1KHz) Weight: 120gFrame Size: 42 x 42mmBody Length: 20mmShaft Diameter: 5mmShaft Length: 20mmD-cut Length: 16.5mmWire: 16inches 4-lead wire★Package Included:4x Nema 17 Stepper MotorConnection:Black(A+), Green(A-), Red(B+), Blue(B-)★NOTE: 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 destroy the motor