Countersinks

Countersinking is the practice of enlarging and bevelling the rim of a drilled hole so that a screw, nail or bolt can be inserted flush against the workpiece. A countersink drill bit is a specially designed drill bit that creates space in the metal that corresponds to the shape of the screw head.

Single-flute construction provides less aggressive and slower cutting than multi-flutes, therefore reducing the risk of chattering. A single flute can be used for general-purpose countersinking and deburring on low-density materials, including mild steel, aluminium, softwood and plastic. Three-flute construction reduces chip load and controls chatter, which permits higher feed rates. Can be used for general-purpose countersinking and deburring in high-density materials, including mild steel, aluminium, hardwood and plastic. Five-flute construction provides optimum stability in hard materials for fast productivity with a fine finish. Perfect for stainless steel and recommended machine use for accurate speed and feed rates. Can be used for general-purpose countersinking and deburring on steel, stainless steel, wood and plastic. Cross Hole construction is the most universal product suiting the widest range of materials. Optimum deburring results are obtained in ferrous and non-ferrous metals. Optimum countersinking results are obtained in softer materials such as wood or plastic. Fluted countersinks are more suited for countersinking hard materials like steel, stainless steel, wood and plastic. Drill and Countersink combinations are ideal for decking, cement sheets, woodwork and steel (dependent on whether the product is TCT or HSS). Decking Drill and Countersink combinations are ideal for timber decking (hardwood and composite materials) and woodworking.

To determine optimum speed, start at the lower end of the speed range, then increase the speed until performance is maximised. It is important not to operate at an excessive RPM as chattering may occur, and the cutting area can overheat and become prematurely dull.