Nominal Size
The Nominal Size is the size assigned to an entity (such as lumber or rebar) for easy reference, and is different from the Actual Size. Typically, the Nominal Size is larger, and most often rounded to an easy fraction.
For lumber, the Nominal Size is the real size of a rough sawn member before it is planed, dressed, or seasoned. These processes will reduce the Actual Size of the member. A piece of 2x4 (nominal) is typically around 1.5"x3.5" (actual).
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