Which threaded tool is used for cutting internal threads in holes?

The tool specifically designed for cutting internal threads in holes is known as a tap. Taps come in various sizes and are categorized based on the thread type and the material of the workpiece. Using a tap, a technician can create internal threads accurately, enabling screws or bolts to fasten securely within the hole.

While other options such as a helicoil, thread chaser, and thread repair insert can be involved in threading processes, they serve different purposes. A helicoil is used for repairing damage to existing threads by inserting a coil, rather than cutting new threads. A thread chaser is primarily used for external threads and forming threads in a more specific context, such as lathes. Thread repair inserts provide a method for creating an internal thread repair rather than cutting a new one. Thus, for the task of cutting internal threads, a tap is the correct and most efficient tool to use.