What is the outside diameter of a 1 inch type K tube?

For a 1-inch Type K copper tube, the actual outside diameter is standardized at 1.125 inches. This measurement is part of the established specifications for copper tubing, which ensure consistency in size and compatibility for pipe fittings and other plumbing installations.

Type K copper tubing is commonly used for a variety of applications, including residential plumbing and underground service lines, due to its thicker walls compared to other types of copper tubing. While the nominal size of the tubing is 1 inch, the outside diameter must account for both the nominal size and the wall thickness, leading to the standardized measurement of 1.125 inches.

This precise dimension aids in ensuring that connections and fittings can be reliably used with the tubing, minimizing the risk of leaks and ensuring proper system pressure.