Taps and Dies - Definition

Taps and Dies are tools commonly used in metalworking for the cutting of threads in metal parts.

The Tap is used to cut a female thread on the inside surface of a prebored hole, whilst the Die cuts a male thread on a preformed cylindrical rod. Each tool is used independently, but are usually sold in paired sets of both types. The common or garden variety are designed for purely manual operation, but powered versions are found in CNC machine tools.

Taps and Dies can also be used for repairing threads in stripped holes or bolts.