Which tool is ideal for cutting a metal pipe in half before threading?

The ideal tool for cutting a metal pipe in half before threading is a pipe cutter. A pipe cutter is specifically designed for this purpose as it provides a clean and precise cut without causing deformation to the pipe. It works by using a rotating cutting wheel that scores the material evenly around its circumference, allowing for a smooth and straight cut. This is particularly important when preparing a pipe for threading, as the threads need to be accurately aligned and undamaged to ensure proper fitting with other components.

While hand saws and band saws can also cut metal pipes, they may not achieve the same level of precision and may produce a rougher cut, leading to difficulties during the threading process. Additionally, threading machines are primarily used for adding threads to an already-prepared pipe rather than cutting it. Therefore, the pipe cutter is the most suitable choice for cutting a metal pipe prior to threading.