Countersinks and deburrers belong to the countersinking tools and play a very important role in thread cutting. To cut a thread, a cylindrical hole must first be produced. The ends of the hole must now be deburred and converted into frustoconical surfaces before thread cutting.

This process is usually called countersinking and the tools are called countersinks. The funnel-shaped countersink makes it easier to apply the tap. It should therefore be carried out before tapping. The other benefit of the countersinking process is to create space for the screw heads.

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Since there are different screw heads, there are also different countersinks. A distinction is made between flat countersinks and taper countersinks. The countersink produces a truncated cone for the so-called countersunk screws at a corresponding angle (90° cone head). The flat countersink produces a cylinder for the so-called cylinder head screws (hexagon socket screws).

Synonyms for countersinks are: Countersink, flat countersink, taper countersink, countersink or countersink drill.