Which machining process is used to create internal threads in a round hole?

Tapping is the machining process specifically designed to create internal threads in a round hole. This process involves the use of a tool known as a tap, which is inserted into the pre-drilled hole. As the tap is rotated, it cuts the threads into the material, allowing for the insertion of corresponding screws or bolts.

This method is effective for producing threaded holes quickly and accurately, making it a common choice in manufacturing and assembly applications. Tapping can be executed in various materials, and it can create different thread sizes and profiles depending on the design of the tap and the specifications required.

In contrast, drilling is primarily used for creating holes without any threading, boring is intended for enlarging or finishing existing holes, and milling involves removing material to create features on the workpiece's surface rather than cutting threads inside a hole. Hence, tapping stands out as the appropriate choice for forming internal threads within a round hole.