When applying cutting oil while threading pipe, what is the main benefit?

The main benefit of applying cutting oil while threading pipe is to reduce friction. When threading, the cutting process generates heat due to the resistance between the cutting tool and the material being threaded. This heat can lead to premature wear on both the cutting tool and the pipe itself. Cutting oil acts as a lubricant, minimizing the friction between the cutting tool and the pipe, thereby maintaining cooler temperatures during the cutting process. This not only enhances the efficiency of the threading operation but also improves the quality of the threads being formed.

Furthermore, reducing friction ensures that the cutting tool can make cleaner, more precise cuts, leading to better thread integrity. With less friction, there is also a decrease in the chance of damaging the pipe's surface or the threads, contributing to a more reliable and effective installation.

While other benefits like preventing oxide formation, extending pipe life, and improving thread alignment might be associated with threading practices, they are secondary to the immediate and vital role that cutting oil plays in reducing friction during the threading operation.