How often should cutting oil be applied when hand threading steel pipe?

When hand threading steel pipe, applying cutting oil constantly is essential for achieving clean and efficient threads. The purpose of the cutting oil is to lubricate the pipe, reduce friction, and dissipate heat generated during the threading process. This continuous application helps prevent the tool from binding, prolongs its lifespan, and ensures a smooth cutting action.

Applying cutting oil constantly allows for optimal performance throughout the threading process, ensuring that the threads are cut cleanly and accurately, which is particularly important in ensuring a good seal in piping systems. Proper lubrication is vital to avoid damage to both the pipe and the threading tool.

This approach contrasts with applying oil at intervals (like every turn or every 1 to 2 turns), which may not provide sufficient lubrication and heat dissipation for efficient cutting, potentially leading to problems such as rough threads or tool wear.