Specialized category for consumable materials essential for machine tool operation and machining processes. Covers a wide range from liquid consumables such as cutting oils, grinding fluids, lubricating oils, cleaning solutions, and rust preventives, to solid consumables including abrasives, grinding wheel dressers, filters, sealing materials, and gaskets. Handles materials that require regular replacement and replenishment in various machine tools such as NC lathes, machining centers, grinding machines, and milling machines, supporting machine performance maintenance and machining quality stabilization. This category is distinguished from tools and machine parts, specializing in materials that are consumed through use.