Woodworking 101: What Does 4/4 Mean In Lumber ...
Wood Finishing Tips for Woodworkers. What do these lumber fractions mean? 4/4, 5/4, 6/4, 8/4, 10/4, 12/4. In short, these fractions are the names for the thickness of hardwood lumber.The thickness is expressed as a fraction, and goes in increments of quarters of an inch.
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