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Janka Rating Scale

Complete listing of janka ratings for exotic and domestic hardwoods.

The Janka Hardness Test

janka test

The Janka hardness test is a measure of the hardness of wood. It’s an important metric in the lumber industry, used to determine the durability and strength of different types of wood. It was developed as a vriation of the Brinell hardness test. It is one of the best measures of the ability of a wood species to withstand denting and wear. It’s also a good indicator of how hard a wood is to saw or nail.

Test Method: The test measures the force required to push a steel ball with a diameter of 11.28 millimeters (0.444 inches) into the wood to a depth of half the ball’s diameter. The diameter was chosen to produce a circle with an area of 100 square millimeters.

Units of Measurement: The Janka hardness is usually expressed in pounds-force (lbf) in the United States. It can also be measured in kilonewtons (kN) or in kilograms-force (kgf) depending on the region.

Variability: The Janka hardness can vary based on the direction of the grain. For most accurate results, it is tested both on the side (horizontal or radial) and on the end (vertical or axial) of the plank.

Applications: This test is particularly useful in flooring applications. Woods with higher Janka hardness ratings are more suitable for flooring, especially in high-traffic areas or in commercial buildings, because they are more resistant to scratches and dents.

The Janka hardness values have been indicated below for your reference.

Exotic & Domestic Lumber Janka Values

0 lbs JANKA HARDNESS SCALE4000 lbs

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