Hardwood Lumber Dimensions Nominal Size Rough Size Actual Size: Surfaced 2 Sides 6/4 inch 1 1/2 inch 1 5/16 inch (33 mm) 8/4 inch 2 inches 1 3/4 inch (44 mm) 12/4 inch 3 inches 2 3/4 inch (70 mm) 16/4 inch 4 inches 3 3/4 inch (95 mm) Click to see full answer. Accordingly, what is the actual size of a 2×4 board?Lumber Dimensions. 2x4s are not actually 2 inches by 4 inches. When the board is first rough sawn from the log, it is a true 2×4, but the drying process and planing of the board reduce it to the finished 1.5×3. 5 size.Also Know, what size do boards come in? Nominal vs. Actual Measurements of Dimension Lumber Nominal Size Actual Size 2 x 8 1 1/2 x 7 1/4 inches (38 x 184 mm) 2 x 10 1 1/2 x 9 1/4 inches (38 x 235 mm) 2 x 12 1 1/2 x 11 1/4 inches (38 x 286 mm) 4 x 4 3 1/2 x 3 1/2 inches (89 x 89 mm) Thereof, what size is 4/4 lumber? Also in North America, hardwood lumber is commonly sold in a “quarter” system, when referring to thickness; 4/4 (four quarter) refers to a 1-inch-thick (25 mm) board, 8/4 (eight quarter) is a 2-inch-thick (51 mm) board, etc.Is a 4×4 really 4 inches? Believe it or not, there actually is some rhyme and reason for why the actual measurements of dimensional lumber don’t match their names. Actual Dimensions and Nominal Dimensions. Nominal Measurement Actual (inches) Actual (mm) 2 x 12 1-1/2 x 11-1/4 38 x 286 4 x 4 3-1/2 x 3-1/2 89 x 89 4 x 6 3-1/2 x 5-1/2 89 x 140

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