What does the outer diameter (OD) refer to?

The outer diameter (OD) specifically refers to the measurement from the center of a tube or pipe to its outer edge. This dimension is critical in various applications, particularly in the installation of AV systems, where compatibility with other components and fixtures is essential. Knowing the OD helps in ensuring proper fit and alignment in the overall setup, allowing for effective signal transmission and structural integrity.

While the other choices address different aspects of measurement, they do not pertain to the definition of outer diameter. The outer diameter is distinctly focused on the external measurement, which is vital for tasks like selecting appropriate mounting hardware, ensuring clearance, and making connections. Understanding the OD aids in the installation process by confirming that all components are appropriately sized and compatible with one another.