Specialized category for sprockets (gears) that perform power transmission in chain drive systems. Handles sprockets with different tooth counts, pitches, and materials corresponding to various chains including roller chains, conveyor chains, and timing chains. Used in power transmission sections of production lines, conveying equipment, and machine tools to achieve precise rotation ratios and reliable power transmission. Material selection according to application is available including carbon steel, stainless steel, and resin types, with diverse mounting methods to machinery such as keyway machined products and boss-type configurations.