Ball screws are generally categorized into precision-ground and rolled-thread types based on their manufacturing method. Precision-ground ball screws are manufactured to extremely tight tolerances, offering high accuracy and rigidity for applications like CNC machine tools and semiconductor equipment. Rolled ball screws, while slightly less accurate, are more cost-effective and widely used in general automation where high precision is not the primary requirement. Furthermore, they are often differentiated by preloaded and non-preloaded assemblies, where preloaded versions eliminate backlash for precise positioning in industrial robotics.