Submersible pump motor shaft products are the principal accessories for electric submersible pump units and are suited to work in 50℃©, 90℃(A), 120℃(E) or 150℃(F) oil wells. The shaft works in a continuous manner and provides sound air tightness with the connectors. When a single joint of the shaft is not enough for the requirement, it can be connected to either the upper or the lower joint in series. The shaft shows no permanent deformation or defect preventing the motor from regular operation after overspeed test of the motor.