New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What threading specification is commonly used for small pipes?

1. NPT

2. BSP

3. Rc

4. Metric

The correct answer is: NPT

The threading specification that is commonly used for small pipes is NPT, which stands for National Pipe Tapered. This standard is widely utilized in the United States for pipe threads and is characterized by its tapered design that aids in creating a tight seal as the threads are tightened. The taper allows for a better mechanical fit and helps prevent leaks, which is crucial in plumbing and piping systems, especially in applications involving fluids or gases. NPT threads are particularly prevalent in various industries including construction, plumbing, and HVAC systems, making them the go-to standard for small diameter pipes. This specification also adheres to stringent national standards, ensuring compatibility and reliability across different fittings and components typically found in pipe installations. The widespread adoption of NPT threads further validates its standing as the preferred choice for small pipe fittings.