The Janka Hardness Test measures the force needed to embed a .444 inch steel ball to half its diameter in a piece of wood. The higher the number, the harder the wood. Although this is one of the best methods to measure the ability of wood species to withstand indentations, it should be used as a general guide when comparing various species of wood flooring. Remember that the construction and finish also play an important role in the durability and ease of maintenance of any wood floor. Wood is a natural material, and will wear and dent in different ways from plank to plank.
Below are the Janka Hardness rankings for each of the wood species offered by Shamrock Plank Flooring.
| Wood Species | Hardness |
| North American Cherry | 950 |
| American Black Walnut | 1010 |
| Red Oak | 1290 |
| White Oak | 1360 |
| North American Maple | 1450 |
| Hickory | 1820 |
| Brazilian Cherry | 2820 |
| Tigerwood | 2160 |
| Santos Mahogany | 2200 |
