> If your screws are longer than 2”, you’ll need different ones, otherwise they will poke out the top of the board and stab you in the foot. Actually nominal 2 inch lumber has thickness of 1.5" [1]. So your screws should be shorter than 1.5". [1] https://www.archtoolbox.com/materials-systems/wood-plastic-c...
And, as I've recently learned, two-by-four is in fact 1½ × 3½ inches.
How on Earth does that make sense? Why do people call things as if they were X, while knowing perfectly well they're not X? Is this an American thing?