Micro steel balls are high-precision metal spheres with diameters ranging from 0.1 to 3 millimeters, primarily made of carbon steel, stainless steel, bearing steel, or ceramic materials. Through precision cold heading, grinding, and polishing processes, their roundness error can be controlled within 0.1 microns. These miniature components are widely used in precision bearings, micro-motors, medical devices (such as dental drills), and aerospace navigation systems, where their excellent wear resistance, compressive strength, and chemical stability meet the stringent requirements of precision machinery for motion accuracy and durability.