Janka Hardness Rating
A standardized measure of a wood species' resistance to denting, determined by the force required to embed a 0.444-inch steel ball halfway into the wood surface.
In-Depth Explanation
The Janka hardness test is the industry standard for comparing the hardness of different wood species, particularly for flooring applications. Results are expressed in pounds-force (lbf) in the United States. Common benchmarks include red oak at 1,290 lbf, hard maple at 1,450 lbf, and Brazilian cherry (jatoba) at 2,350 lbf. Higher Janka ratings indicate greater resistance to denting and wear, making the species more suitable for high-traffic flooring. However, extremely hard woods can be more difficult to nail, saw, and sand. The Janka scale helps homeowners and professionals select the right species for the expected level of use.
Usage Example
With a Janka hardness rating of 1,820, hickory was the ideal choice for the busy kitchen floor where dropped pots are a daily occurrence.