The cemented carbide wire passing wheel uses the hard and wear-resistant characteristics of cemented carbide materials. It is precisely ground and polished with precision equipment, so that the form and position tolerances of the inner hole, outer diameter and R are within 0.01mm, and the surface roughness of the wire passing groove is more than Ra0.025. Due to its high hardness and smooth surface, the probability of damage to enameled wires and other wires in use is very low.