Which tool is necessary for creating threaded connections on pipes?

Creating threaded connections on pipes requires a threading machine. This tool is specifically designed to cut threads into the ends of pipes, allowing them to be connected securely using threaded fittings. The threading machine ensures that the threads are uniform and properly sized for the specific type of connection needed, which is crucial for maintaining the integrity and functionality of the pipe system.

The other tools listed serve different purposes in pipefitting. A wrench is typically used for tightening or loosening fittings that are already threaded, rather than creating new threads. A cutting torch is employed for cutting pipes, especially those made of metal, but does not create threads. A measuring tape is essential for measuring lengths and ensuring precise cuts but does not play a role in the threading process itself. Therefore, the threading machine is the only tool among the choices that directly performs the function of creating threaded connections.