Precisely processed from high-quality alloy steel and strengthened by quenching and tempering heat treatment, it achieves moderate hardness and excellent toughness with outstanding wear resistance, anti-seizure performance and deformation resistance. The shaft boasts high coaxiality and strict tolerance control with smooth and wear-resistant surface for accurate and reliable interlock positioning. It effectively prevents random gear engagement, cross gear and false gear shifting with stable locking logic, compatible with ZF transmission operating mechanism. It resists rust and stagnation under long-term working conditions, matching original factory standards for installation with long service life and outstanding safety and stability.