Industrial Maintenance Technician Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

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What does "N.P.T." stand for when stamped on a tap?

National Pipe Thread

The term "N.P.T." stands for "National Pipe Thread." This designation indicates a standardized method for creating the threads of pipe fittings and connectors in the United States. N.P.T. refers specifically to the dimensions and shapes of the threads, which ensures compatibility between piping systems and fittings. The N.P.T. threads are tapered, which allows for a better seal when the threaded components are joined together, helping to prevent leaks in plumbing and industrial applications.

While the other options—like National Plumbing Thread or Non-Pressure Tap—might sound plausible, they do not represent any recognized standard in piping or thread specifications. Understanding that N.P.T. indicates a national standard is critical for anyone involved in industrial maintenance, as it guides the selection of appropriate components for safe and effective assembly.

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National Plumbing Thread

Non-Pressure Tap

Non-Positive Thread

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