The through shaft is a core component of a heavy-duty vehicle's transmission system, primarily used to connect the middle and rear axles for long-distance power transmission. It needs to withstand enormous torque and complex alternating loads, thus requiring extremely high standards for materials and manufacturing processes. A high-quality drive axle effectively reduces transmission noise and energy loss, ensuring the vehicle maintains strong power and stable performance under complex road conditions, making it an indispensable guarantee for efficient logistics and engineering transportation.