We provide transmission shaft assemblies for light, medium and heavy commercial vehicles, covering 9 series. It has the ability of independent synchronous development and test verification, and has key technologies such as long-life maintenance-free, light-weight shaft tube, improved NVH noise reduction filling, powerful grinding process of end face keys, nylon-coated high-precision sliding spline pairs, and high-precision dynamic balance. , Which can meet the needs of different customers at home and abroad.