Countersink
Countersinking is a method to cut a conical hole into a manufactured object. Countersink drill bits or cutters are tools used to cut such a hole. By using method of countersink, the screws or bolts can be covered, protecting them and increasing their structural lifetime, moreover, it can often prevent exposing harsh edges.
Haisheng Machinery mainly supply 3 different types of cobalt high-quality high speed steel countersinks: fluted countersink, cross-hole countersink and flat countersink.
Flute Countersink
3 flute countersink is the common one on the market, it has affordable price, wide cutting angle range.
Cross-Hole Countersink
Cross-hole countersink, also known as zero-fluted countersink, is a cone-shaped tool with a cutting edge provided by a hole that goes through the side of the cone， which allow it free of burrs and chatter.
Flat Countersnk (Counterbore)
Flat countersink, also known as counterbore, is a tool used to cut a flat-bottomed hole. At its tip there is a fixed guide which is inserted into the pre-drilled hole. This ensures a stable guidance of the drilling machine and precise working.
