Janka Hardness Chart

The Janka Hardness Test measures the capacity of a wood to withhold pressure. This is done by measuring the amount of force required to insert a 11.28 millimeter (.444 inches) diameter steel ball half its diameter deep into the wood. Doing so creates a circular indention with an area of 100 square millimeters. These particular data are expressed in pounds-force (lbf), and are side hardness data. This means that the testing was done on the surface of a plank, with the force exerted perpendicular to the grain.

This chart can be used as a guide for the hardness of woods. It is helpful in determining how hard it will be to either nail, staple, or saw the particular species of wood. It can also be used to estimate how easily a wood floor will withstand pressure causing dents and wear. The higher the rating, the harder, or more durable, the wood will be. Browse our hardwood flooring products and find the hardwood floor that's right for you.

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