In W12X16, what does the 16 represent?

• A. Weight per linear foot
• B. Nominal depth
• C. Width
• D. Height

Answer: (A)

In structural steel shape designations, the number after the depth indicates weight per unit length. For a W12x16, the first number (12) is the approximate overall depth of the beam in inches. The second number (16) represents the weight per linear foot, in pounds. So the 16 means the beam weighs about 16 pounds per foot of length. This weight reflects the cross‑sectional area and helps with calculations for loads and sizing. It isn’t the width or the exact height, which aren’t represented by that second number.