A pipe is generally threaded by using a:

Threading a pipe typically involves using a die, which is a tool designed to cut external threads onto a cylindrical object, such as a pipe. The die has sharp edges that shape the material as the pipe is turned, effectively creating the threads necessary for connections with other pipe fittings or components.

In the context of pipe threading, the use of a die is crucial because it ensures a precise and uniform thread profile, which is essential for proper sealing and fitting. Other tools mentioned, such as taps, are used for cutting internal threads in materials, while yokes and swedges serve different purposes in the realm of piping and construction. The focus here is on producing external threads, making the die the appropriate choice for this task.