Nominal Dimension.

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1. The named size; compare with Actual Size. 2. An approximate rough cut dimension assigned to a piece of material as a convenience in referring to the piece, such as 2 by 4 or 500 pound. 3. The stated size of a piece of lumber; its actual size is smaller. 4. A dimension greater than a specified masonry unit dimension by the thickness of a mortar joint. 5. This is the approximate facial size or thickness of tile, expressed in inches or fractions of an inch, for general reference, such as a 4 by 4″ tile. 6. Tubing measurement which has an inside diameter the same as iron pipe of the same stated size.”

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