Why are pipe threads tapered?

Tapered pipe threads are designed specifically so that as they are tightened, they push against each other, which creates a more secure and watertight seal. The taper of the threads means that the diameter of the pipe increases gradually, allowing the threads to draw closer together as they are screwed into a fitting. This design greatly enhances the friction and pressure at the joint, effectively resisting leaks.

The functionality of tapered threads is paramount in plumbing and piping applications, as it prevents fluid from escaping, maintaining system integrity. This sealing ability is crucial in various industries, including gas, water, and oil.

While other factors, such as aesthetics, may have minor roles in design choices, they are not the primary purpose behind the taper in pipe threads. Similarly, tapering the threads doesn't inherently lower friction; instead, it enhances sealing effectiveness. Finally, while tapered threads can make disassembly easier in some cases, that is not their primary function; disassembly typically relies more on the type of thread and joint design rather than the taper itself.