Made of high-elasticity wear-resistant steel with moderate hardness and good toughness, it is used for internal assembly of ZF 1328 and 1358 series gearboxes. Strict production tolerance control ensures reasonable assembly clearance and firm positioning without falling off. Its smooth burr-free surface enables smooth assembly with high fatigue resistance, free from distortion and fracture under long-term repeated stress. With fine anti-corrosion and wear resistance, it is easy to mount and accurately realizes internal limiting and separating function, optimizing internal structure and improving transmission smoothness.