Wood hardness or Janka scale.

The Janka scale can help you choose an appropriate wood for your project. The scale indicates the hardness of the wood. The higher the number, the harder (and generally more durable) the wood will be. A harder wood will stand up to high traffic or heavy use better than a softer wood, but it will also be more difficult to sand or hammer a nail into. To see how different wood types rate in terms of hardness, use this scale for reference:


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