1. Strengthen the PCB in the motor and adopt a stator process 2.The stator teeth of the motor are evenly polished and the inner hole has high precision. The speed is stable and accurate during the working process. 3. The structure is stable and does not jam the machine. The of the motor rotor is coated with epoxy resin, the rotor is integrally sealed and cured at high temperature, and the rotor After processing the outer garden, the machining residues such as iron pins and the like are not easy to be found in the tooth groove, and the motor is stable for long-term use without the risk of jamming. 4.The overall stability of the motor is high via Kossel, Prusa l3, Ultmaker, corexy and other motors. Uniform rotation speed, low noi5.Suitable for engraving machine, printer, equipment, embroidery machine, stage lighting, textile automation,printing,packaging and other industries automation equipment. Manufacturer Part Number: 17HS8401 Step Angle: 1.8° Step Accuracy: 5% Holding Torque: 59Ncm(83.6oz.inch) Rated Current/phase: 2.0A Phase Resistance: 1.4ohms Voltage: 2.8V Inductance: 3.0mH±20%(1KHz) colour: black Material: Aluminum alloy Size: 42x42x48mm Package Contents: 4 set x of Stepper Motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.