STEPPERONLINE Nema 17 Stepper Motor 2A 55Ncm Bipolar 1.8 Degree 4-Lead for 3D Printer CNC Extruder, 5 Pack

This bipolar Nema 17 stepper motor with step angle 1.8deg and size 42x42x48mm. It has 4 wires, 4.5phase draws current 2A, with holding torque 55Ncm. Electrical Specification *Manufacturer Part Number: 17HE19-2004S *Motor Type: Bipolar Stepper *Step Angle: 1.8 deg *Holding Torque: 55Ncm *Rated Current/phase: 2A *Phase Resistance: 1.3ohms *Inductance: 2.4.00mH ± 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: 1000mm *Weight: 400g Connection A+: Black, A-: Blue, B+: Green, B-: Red Warning: ***On some systems, the middle 2 wires on the motor side are swapped. This is easy to fix by slightly prying back the white nubs and swapping the wires. Otherwise they work fine.*** 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.