A counterbore is a flat bottomed hole that enlarges an existing hole. It is typically used when a fastener is to be used on a workpiece, the head of which must be either flush with or below the surface of the workpiece.


Reaming is a process that enlarges a pre-existing hole, usually drilled, utilizing a special reaming tool. This ensures a closer tolerance hole than can be achieved by drilling alone.


Tapping is a process that forms threads in a drilled or reamed hole, usually for screws or bolts. The tool used for this process is called a tap.

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