What does nominal thickness mean?

mean nominal thickness
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What does nominal thickness mean?

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Nominal thickness is usually greater than the actual size. This is an industry term used by lumber yards, in effect, rounding up to the next denomination. For example, an average 2 X 4 board is actually only 1.5 inches thick, the nominal thickness is 2 inches. 1 inch boards used to make wood fences are actually only about .65 inches thick.