2X4 Nominal Size. Prepared nominal sizes timber is used for finishing the job. However, there is a difference between the nominal size (what the lumber is referred to) and the actual size. At the lumberyard, board sizes are typically given in nominal dimensions, but those aren't the true sizes.

Nominal Lumber Sizes Are Different Than Actual Dimensions Softwood Lumber Lumber Sizes Lumber from i.pinimg.com

However, there is a difference between the nominal size (what the lumber is referred to) and the actual size. The nominal 2x4 thus became the actual so, why does the awareness about the slimming of its actual size matter? Nps is often incorrectly called national pipe size, due to confusion with national pipe thread (npt).

Nominal dimensions refer to the rounded number used on the label packaging of both air filters and lumber.

Every 'a' size is double the previous size: The actual size is always a little bit smaller. Dimensional lumber is sold using what is referred to as the nominal dimensions of a board. We have listed common aspect ratios, along with popular image and photo sizes to help you create your next project. Once you understand that nominal size is not an exact measurement, but rather a rounded number that makes searching for a filter and packaging lumber more efficient. What you might not realize is that filters are not sold by their. A nominal 2x4 board starts out 1.56 in. A3 is twice the size of a4, and so forth.