Why NPT, BSPP, and ORB Threads Are Not Interchangeable

NPT, BSPP, and ORB threads may look similar at a glance, but they are built to completely different standards, which means they are not compatible with one another. NbacPT (Male Pipe Taper) threads are tapered, meaning the diameter becomes wider as the threads progress, allowing the seal to form through thread wedging and thread sealant. In contrast, BSPP (British Standard Parallel Pipe) and ORB (O-Ring Boss) threads are parallel, which means the diameter does not taper at all. This alone creates a major difference in how they seal and how they are used in hydraulic systems. Shop NPT fittings: https://www.titanfittings.com/... Shop BSPP fittings: https://www.titanfittings.com/... Shop ORB fittings: https://www.titanfittings.com/...

Thread pitch is another critical difference. BSPP and ORB threads have specific pitches and profiles designed for their standards, while NPT uses a completely different pitch and thread angle. Because of this, attempting to thread an NPT male into a BSPP or ORB female will instantly cause resistance. This is where cross threading occurs, leading to damaged threads, leaks, and in many cases, the need to replace the fitting or even the port.

These thread types are not interchangeable, and any attempt to use one in place of another will permanently damage components. The safest approach is to identify the thread type correctly and select the proper adapter designed for that standard. Titan Fittings carries a full range of stainless steel and carbon steel MPT, BSPP, and ORB adapters to ensure every hydraulic connection is the right fit the first time. Explore all hydraulic thread types: https://www.titanfittings.com/...