Features1Carbon Steel Construction: Made from carbon steel material with exquisite craftsmanship, this 42 stepper motor is wear proof and sturdy for long lasting use. 2Versatile Specifications: Featuring 2 phases, 1.8 degree step angle, 0.4N.M min holding torque, 800RPM start speed, 1000RPM operating speed, 3.4V DC rated voltage, and 1.7A DC rated current for reliable performance. 3High Torque Low Resistance Self Inductance: With low self inductance, this stepping motor offers high torque, low resistance, responsiveness, and operates at a low working temperature for efficient heat dissipation and safety. 4Noiseless: The rotor of the stepper motor adopts German technology and is coated with rotor glue to prevent carbon steel oxidation and abrasion induced surface burrs that could bring to motor noise. 5Wide Application: This stepper motor finds applications in a variety of fields including 3D printers, stage lighting, engraving machine, textile machinery, medical equipment, placement machines, non standard equipment, and automation equipment.SpecificationItem Type: Stepper MotorMaterial: Carbon SteelProduct Size: Approx. 42.3x40mm/1.67x1.57inNumber of Phases: 2 PhaseStep Angle: 1.8 DegreeRated Current: 1.7A DCHolding Torque: 0.4N.M MinStarting Speed: 800RPMOperating Speed: 1000RPMPhase Resistance: 1.9510Phase Inductance: 4.45mH10Rotor Inertia: 57g.cmInsulation Resistance: 100m minInsulation Class: Class BPackage List1 x Stepper Motor1 x Wire