Compatible with Hitachi DH40FR DH40MR DH40SR DH40MRY. High-purity copper wire windings are used, which have excellent conductivity and low heat generation, ensuring efficient operation of the equipment and extending its service life. The rotor is made of laminated silicon steel sheets, which has strong magnetic permeability and mechanical strength. With dynamic balancing treatment, it runs more smoothly and has less vibration. It is especially suitable for high-load working scenarios such as frequent drilling, crushing, and wall-breaking, continuing the strong impact and drilling performance of the original machine. Replacing the rotor stator can effectively repair common problems such as insufficient power, severe heating, or inability to start the electric drill., Manufacturer: EMSea