Nominal Wood Sizes
Youve just run into the reality of actual lumber sizes as compared to the nominal sizesthe sizes by which they are identified in the store.
Nominal wood sizes. The actual size is always a little bit smaller. At the same time length of lumber normally does not have nominal dimensions and only actual size determine. US Wood Screws - Pilot Holes - Hard wood and soft wood pilot holes shank clearance holes and countersink diameters.
Plywood is graded so that each face receives a grade of A B C or D with A representing the smoothest sanded finish. The thickness always increases in 1 step intervals. Actual Dimensions and Nominal Dimensions.
How wide is 12 lumber. A sheet of 12-inch plywood is really 1532 inch thick while a 34-inch sheet is 2332 inch thick. US Wood Screws - Nominal Sizes - Wood screws - nominal sizes vs.
Typical length of lumber. Thickness and width dimensions mean the nominal sizes of the timber at a moisture content of 20The standard measurements of sawn dimensioned and all-round planed timber. Timber - Structural Lumber Section Sizes - Basic size area moments of inertia and section modulus for timber - metric units.
The difference has to do with the sawmill process and shrinkage of the wood. The measurements by which lumber is sold is virtually never the same as the actual dimensions of the boards when you measure them. Other lengths and modules must be agreed separately.
The sizes presented are based on commercially available lumber within the USA so the data shown is in Imperial Inches units. The Nominal Size is how we refer to the lumber for example a 2 X 4. Logically 12 would mean the wood is 1 inch x 2 inches right.