Is there a difference between NPT and pipe thread?

The tapered nature of the NPT system is particularly well-suited for jointing threads, as it allows for a tight, leak-proof fit when properly sealed. This is why NPT is commonly used in hydraulic circuits and other applications where a reliable seal is essential.

NPT, or National Pipe Thread Tapered, is a standardized threading system featuring a tapered male and female thread design. This taper allows for a secure seal to be achieved through the use of Teflon tape or a jointing compound.

In hydraulic circuits, pipe threads play a crucial role in ensuring the integrity and efficiency of the system. The threads can be categorized into two distinct types: Jointing threads and others.

Jointing threads are specifically designed for creating pressure-tight joints. They achieve this by relying on the sealing action provided by the threads themselves. This type of thread is characterized by a tapered external thread or a tapered internal thread, depending on the application.

Apart from jointing threads, there are other types of pipe threads used in hydraulic circuits. These threads may not rely on sealing on the threads themselves, but rather on other methods such as gaskets or O-rings to create a seal.