| National Pipe Straight thread (NPS)

NPT (National Pipe Taper) and NPS (National Pipe Straight) threads share similarities in terms of their thread angle (60° included angle), flat peaks and valleys, and pitch (threads per inch). However, there is a fundamental difference between them: NPT threads are tapered, while NPS threads are straight or parallel. It is important to note that NPS threads require the use of a gasket or O-ring to establish a proper seal.

| National Pipe Taper thread (NPT)

The American National Standard Taper Pipe Thread (NPT) is commonly utilized in various industries. NPT threads are designed with a taper, allowing them to create a reliable seal when tightened. As the threads engage, the flanks press against each other, forming a tight connection. This makes NPT threaded pipes suitable for applications involving the transportation of liquids, gases, steam, and hydraulic fluids, as they ensure effective sealing and prevent leakage.