What does NPT stand for in relation to threaded pipes?

NPT stands for National Pipe Thread, which is a standard for threaded plumbing pipes and fittings in the United States. This designation is essential for ensuring compatibility and sealing between pipe connections. The National Pipe Thread system is defined by specific dimensions and tolerances, allowing for the effective transfer of fluids and gases while minimizing leakage.

The use of NPT is critical in various applications, particularly in plumbing, HVAC, and industrial processes. Understanding this terminology is vital for professionals working with mechanical systems, as incorrect threading types can lead to improper fittings and potential system failures. This clarity on dimensions also ensures that proper tools can be used for assembly and disassembly without damage to the threads.

The other options do not reflect established standards or terms in the context of threaded pipes. Concepts like "Normal Pipe Thread," "Narrow Pipe Thread," and "National Piping Technique" do not exist in the same widely accepted standard, making National Pipe Thread the clearly accurate choice.