What's the Difference Between NPT and NPSC Thread | PASSIONHOSE

July 07, 2023

NPT (National Pipe Taper) and NPSC (National Pipe Straight Coupling) are two different standards for pipe threads in the United States. The main difference between NPT and NPSC threads lies in their shape and intended applications.

NPT threads are tapered, which means the diameter of the thread decreases gradually toward the end. The taper helps create a tight seal between the male and female threads when they are tightened together. NPT threads are commonly used in applications where a leak-resistant connection is crucial, such as plumbing, hydraulic systems, and gas lines.

On the other hand, NPSC threads are straight threads, meaning the diameter remains constant along the length of the thread. Unlike NPT threads, NPSC threads do not provide a sealing function on their own. They typically require the use of additional sealing methods such as thread sealant, tape, or gaskets to prevent leaks. NPSC threads are often used in applications where a tight seal is not necessary, such as structural components or mechanical assemblies.

So, the key differences between NPT and NPSC threads are:

1. Shape: NPT threads are tapered, while NPSC threads are straight.

2. Sealing: NPT threads provide a sealing function due to their taper, whereas NPSC threads require additional sealing methods.

3. Applications: NPT threads are used in applications that require leak-resistant connections, while NPSC threads are used in applications where sealing is not critical or where additional sealing methods can be employed.

4. It's worth noting that these standards are specific to the United States, and other countries may have different thread standards.

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