The Janka hardness scale indicates the relative hardness of a given species of wood. It ranges from 22 pounds-force to over 5000 lbf, determined by measuring the force required to embed an 11.28 mm (0.444 in) steel ball into wood to half the ball’s diameter. Huh.
Men’s accessory company Best Made Co., known for their fancy axes, maple syrup, and other goods, made these beautiful graphics exploring a few species. They say, “we selected a few wood species with their relative Janka hardness values. We’ve also included a few of the more interesting facts and uses for each wood.”