1、Stepper motor is known by its property to convert a train of input pulses into a precisely defined increment in the shaft position 2、This is a high quality motor that can be used for a long time without stuck 3、It has a quite stable performance during work and will not loss step 4、Low noise and big torque, this is a great choice if you need a stepper motor 5、Stepper motor can be widely used for 3D printer, CNC engraving machine, etc Features: Stepper motor is known by its property to convert a train of input pulses into a precisely defined increment in the shaft position. This is a high quality motor that can be used for a long time without stuck. It has a quite stable performance during work and will not loss step. Low noise and big torque, this is a great choice if you need a stepper motor. Stepper motor can be widely used for 3D printer, CNC engraving machine, etc. Specifications: Step Angle: 1.8° Phase Current: 1.7A Phase Resistance: 1.5Ohm Phase Inductance: 2.8mH Holding Torque: 40N.cm Braking Torque: 2.2N.cm Rotor Inertia: 54g.cm² Wire: 4(Blue, green, yellow, red) Step Angle Accuracy: + - 5%(full step, no load) Resistance Accuracy: + - 10% Inductance Accuracy: + - 20% Max. Temperature Rise: 80℃ (rated current, 2 phase on) Operating Temperature: -20℃~+50℃ Insulation Resistance: 100 MΩ Min. , 500VDC Electric Strength: 500VAC for 1minute Radial Clearance: 0.02Max. (450g-load) Axial Clearance: 0.08Max. (450g-load) Max. Radial Pressure: 75N (20mm from the flange) Max. Axial Pressure: 15N Package Includes: 1 x Stepper Motor