Centering drill is a specialized short drill used for pre positioning before drilling in mechanical processing. Its core functions include precise centering, hole chamfering, protection of the main drill, and improvement of hole quality. It has high rigidity, short cutting edge, and thin transverse edge, which can quickly process shallow guide holes on the surface of the workpiece, prevent the initial "slip" and offset of ordinary drill bits, and ensure the accuracy and coaxiality of the hole position. The common top angles are 90 °, 120 °, and 142 °, which need to be matched with the subsequent drill bit angles to avoid chipping.

    The centering drill can complete centering and chamfering in one go, reserve grooves for tapping, and simplify the process; Especially suitable for processing inclined surfaces, curved surfaces, thin plates, and deep holes, significantly improving stability and surface smoothness. The material is mostly high-speed steel or hard alloy, suitable for materials such as steel, cast iron, stainless steel, etc., widely used in high-precision scenarios such as CNC machining, automotive, aviation, etc.