What does the designation (C 8x20) represent?

The designation (C 8x20) is used to identify the dimensions and weight of a structural channel. In this case, the "C" indicates that it is a channel section. The number "8" represents the height of the channel, which is 8 inches tall. The number "20" indicates the weight of the channel per linear foot, which is 20 pounds.

Understanding this designation is crucial in structural engineering and fabrication, as it conveys essential information about the size and load-bearing characteristics of the material. When selecting parts for a project, engineers and builders rely on these specifications to ensure the structural integrity of the designs.

This follows the standard nomenclature used in structural steel design, where the first number typically refers to the height of the shape in inches, and the second number indicates the weight in pounds per foot of the length of that shape.