Australian Hardwood Timbers are among some of the world’s hardest by the internationally recognised and uiversally adopted Janka Hardness Ratings. Just as some people have the genetics that allow them to run fast, jump high, run long distances or bench press heavy weights, species of timber also have genetic dispositions that allow them to withstand intense heat, humidity, high traffic, high heels, water, etc.
Under the Janka Hardness Rating, simply, the higher the number the harder the wood. These ratings were determined using the Janka Hardness Test which measures the side hardness measure of the force required to embed a .444 inch steel ball to half its diameter into the wood. This is one of the best measures of the ability of wood species to withstand denting and wear. It is also a good indicator of how hard a species is to saw or nail.