Annular cutters, also known as core drills, are specialized cutting tools used in metalworking to create precise, smooth, and burr-free holes in various types of metals. Unlike traditional twist drills, annular cutters remove only the material at the periphery of the hole, resulting in a faster and more efficient cutting process. These tools are typically used with magnetic drilling machines, which secure the material in place, allowing for accurate and stable drilling. Annular cutters are ideal for applications in construction, manufacturing, and maintenance industries where high precision and productivity are crucial.

The design of annular cutters includes a hollow cylindrical body with multiple cutting edges around the circumference. This design allows for the removal of a cylindrical slug of material from the workpiece, significantly reducing the amount of material that needs to be drilled through compared to solid twist drills. The teeth of annular cutters are often made from high-speed steel (HSS) or tungsten carbide, materials known for their durability and ability to retain sharpness even when cutting through tough metals. Additionally, the cutters feature flutes that facilitate chip evacuation, preventing clogging and ensuring a smooth cutting operation.

One of the significant advantages of using annular cutters is their efficiency in creating larger diameter holes. Traditional twist drills become less efficient and more prone to deflection as the hole diameter increases, leading to inaccuracies and potential tool breakage. In contrast, annular cutters maintain their rigidity and accuracy even at larger diameters, making them a preferred choice for creating holes ranging from 12mm to over 150mm in diameter. This efficiency translates into reduced drilling time and lower operational costs, making annular cutters a valuable investment for industrial applications.