There are a few key differences between the plumbing standards used between European plumbing (BSPT) and North America (NPT) highlighted in the chart below:
The main takeaways are:
- The pitch of the threads (i.e. distance between each thread) are the same (14 threads per inch)
- The main differences are subtle and reside in the profile of the threads. The profiles have 2 main differences (NPT vs. BSPT):
- The angle of the profile of the thread (60-deg vs. 55-deg)
- Tips of the profile of the thread (flat vs. round)
The European adapters are almost identical to the North American, however, their slight difference may lead to an increased risk of leaks over time when used with North American plumbing.