Which tool is specifically designed to cut threads into galvanized and black-iron pipes?

The tool specifically designed to cut threads into galvanized and black-iron pipes is the dies. Dies are cutting tools that are used to create external threads on the surface of a pipe. When working with pipes like galvanized and black-iron, it is essential to create precise threads to ensure a proper connection between pipe fittings. The die fits around the pipe and, when turned, removes material to form the desired thread pattern.

While a threading machine also assists in creating threads, it is essentially a tool that incorporates dies as part of its mechanism. The threading machine automates the process and can handle larger pipes more efficiently, but it still relies on dies to create the actual threads.

A die wrench is used to turn the dies while making the threads but is not the tool that actually cuts the threads. Similarly, a cutter tool is used for cutting pipes to length rather than cutting threads. Thus, understanding that dies are the specific tools that cut threads helps clarify their role in plumbing tasks involving pipes.