On a 1-1/2 inch pipe, how many threads per inch can be found?

For a 1-1/2 inch pipe, the standard threads per inch (TPI) is typically 11-1/2. This standard measurement is based on the American National Standard Pipe Thread (ANSI/ASME B1.20.1) for tapered threads, which are commonly used in plumbing applications. The dimension of 1-1/2 inches refers to the nominal diameter of the pipe, and specifically, tapered threads are designed to create a tight seal when two pipe sections are screwed together. The 11-1/2 threads per inch specification ensures compatibility with fittings and allows for proper joint integrity.

In contrast, other options for threads per inch such as 10, 11, and 12 do not align with the established threading standards for a 1-1/2 inch pipe within the plumbing industry, leading to incorrect thread engagement and potential leakage or failure of threaded connections.