NPT vs BSPP vs ORB Threads, Why They Are Not Interchangeable

Selecting the correct thread type is essential for preventing leaks and protecting the integrity of your hydraulic system. NPT, BSPP, and ORB threads may look similar at first glance, but their design is fundamentally different. For example, NPT threads are tapered, which means they seal by wedging tighter as they are torqued. In contrast, BSPP and ORB threads are straight and rely on an O-ring or mechanical seat to create a leak-free connection. These differences make the threads incompatible and risky to interchange. For tapered options, shop NPT Male Pipe Adapters here: https://www.titanfittings.com/...

The thread pitch and geometry between these three systems also vary significantly. Trying to force a BSPP or ORB fitting into an NPT port will instantly begin to cross-thread, since the angles and spacing simply do not match. Once a hydraulic port is cross-threaded, it usually requires complete replacement, which drives up downtime and repair costs. For precision straight-threaded applications, view our ORB Adapters here: https://www.titanfittings.com/...

BSPP fittings, commonly used in European and industrial systems, rely on a bonded seal or O-ring face to hold pressure. ORB fittings, common in North American hydraulic systems, use an O-ring on the male side to seal inside a machined flat on the female port. Both are excellent sealing methods, but neither is compatible with NPT. Whether you work with NPT, BSPP, or ORB, Titan Fittings carries stainless steel and carbon steel adapters built for long-term reliability. Browse our BSPP Adapters here: https://www.titanfittings.com/...