The part name and material / characteristic corresponding to the product serial number ﹣ serial number name material / characteristic serial number name material 1 front cover material yl102, processed by high-precision lathe, the dimension is tested by three coordinates, the quality of the part is guaranteed; 5. The shell of the stator assembly is an automatic coiler, with good roundness and high precision; the high-performance magnetic tile is used to ensure the stable power of the motor and powerful working 2. The uni directional assembly The hardness of driving gear hrc58-63, impact resistance, wear resistance and long service time; the unidirectional slip torque of the uni directional device ≥ 120n.m6 end cover / brush holder assembly end cover cold extrusion forming, high precision and good concentricity; carbon brush is made of imported Japanese materials