What does the "24" refer to in a beam designated as W24X72?

In the designation "W24X72," the "24" specifically refers to the depth of the beam in inches. This means that the beam has a depth of 24 inches from the top flange to the bottom flange. The designation system for structural steel beams includes the beam's depth as the first number, and in this case, it indicates that the profile is a wide flange beam.

The second number, "72," indicates the weight of the beam per linear foot, which in this case is 72 pounds. Understanding the designation of structural members is crucial for engineers and construction professionals, as the depth affects the beam's load-carrying capacity and suitability for specific applications within construction projects. This system ensures that professionals can effectively communicate specifications and select appropriate materials for their structural needs.