1Uniform speed, no out-of-step: Motor-enhanced PCB board and unique stator technology ensure uniform polishing of the stator gear of the motor, high precision of the inner hole, stable and accurate working speed. 2The structure is stable and will not get stuck. The rotor surface of the motor is coated with imported epoxy resin. The rotor is integrally sealed and cured by high temperature. After the rotor is worn, processing residues such as iron pins are less like 3Stable speed and low noise: For Kossel/Prusa 13/Ultmaker/Colexy and other motors have high stability. The motor has high stability, uniform speed and low noise. 4Motor coil: The motor wire is made of pure copper enameled wire. It is made through the current wire process. The copper wire is evenly distributed, and the motor generates less heat. It will not cause deformation and noise problems when carried for a lo 5Silicon steel rotor: It adopts international silicon steel material bearing and is imported by German technology. The surface is coated with imported rotor rubber. The oxidation of the textile silicon steel reduces the surface burrs after grinding, the o Features: Uniform speed, no out-of-step: Motor-enhanced PCB board and unique stator technology ensure uniform polishing of the stator gear of the motor, high precision of the inner hole, stable and accurate working speed. The structure is stable and will not get stuck. The rotor surface of the motor is coated with imported epoxy resin. The rotor is integrally sealed and cured by high temperature. After the rotor is worn, processing residues such as iron pins are less likely to occur in the backlash. The long-term use of the motor is also stable and does not pose a risk of jamming. Stable speed and low noise: For Kossel/Prusa 13/Ultmaker/Colexy and other motors have high stability. The motor has high stability, uniform speed and low noise. Motor coil: The motor wire is made of pure copper enameled wire. It is made through the current wire process. The copper wire is evenly distributed, and the motor generates less heat. It will not cause deformation and noise problems when carried for a long time. Silicon steel rotor: It adopts international silicon steel material bearing and is imported by German technology. The surface is coated with imported rotor rubber. The oxidation of the textile silicon steel reduces the surface burrs after grinding, the output is stable, the noise is low, and the life is longer. Specification: Step angle accuracy: 5% (full step, non-loaded) Resistance accuracy: 10%; inductance accuracy: 20% Temperature rise: maximum 80deg (rated current, 2 phases) Ambient temperature: 20deg ~ 50deg Insulation resistance: 100M Min, 500VDC Insulation strength: 500VAC / minute Package list: 1 * 17HS4401S Stepper Motor 1 * 1 Meter 4pins Cable