Countersink
A countersink is a tool for enlarging or deburring a bore opening with a conical profile – i.e. countersinking the bore to avoid sharp edges or to allow screw heads to seat flush.
Functions:
- Removes the burr produced during drilling.
- Provides a clean seating surface for screw heads or assembly elements.
Practical example:
After drilling a core hole, the edge of the opening is machined with a countersink so there are no sharp, protruding edges when inserting the tap or thread insert.