Tapper (noun)

A device for cutting screw threads or for making holes, especially one for cutting internal screw threads.

Origin:

Middle english (denoting a tool for cutting threads): from old french tappeur, from tap "tap".

Examples:

1. The mechanic used a tapper to make threads for the bolt.
2. A tapper is a tool used to make screw threads.
3. The tapper is made of hardened steel.
4. The tapper is adjusted to the correct size for the thread being cut.
5. The tapper is turned by hand or by a machine.