The designation '2 1/2-8' conveys which two primary characteristics?

• A. Nominal Pipe Size And Threads Per Inch
• B. Pressure Rating And Material
• C. Outer Diameter And Wall Thickness
• D. Color And Grade

Answer: (A)

This designation communicates the size and the thread count used for pipe fittings. The first part, 2 1/2, is the nominal pipe size—the approximate inside diameter used to identify fittings, valves, and piping that will connect together. The second part, 8, is the threads per inch, indicating the NPT thread pitch so the pipe can mate with fittings that have the same thread count. This designation doesn't specify pressure rating or material, and it isn't about outer diameter or wall thickness, which depend on pipe schedule but are not shown in this sizing format. In practice, using the correct nominal size and thread count ensures proper threading and compatibility with standard gas fittings.