This test measures the hardness of wood using a 0.444"-diameter spherical indenter. The peak load required to penetrate the wood up to the radius of the indenter is recorded as the Janka hardness value.
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Janka Hardness
This test measures the hardness of wood using a 0.444"-diameter spherical indenter. The peak load required to penetrate the wood up to the radius of the indenter is recorded as the Janka hardness value.
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Wood Species
Janka Hardness (lb) Poplar 600 Douglas Fir 660 So. Yellow Pine (loblolly & short leaf) 690 So. Yellow Pine (longleaf) 870 Black Cherry 950 Teak 1000 Black Walnut 1010 Heart Pine 1225 Yellow Birch 1260 Red Oak (Northern) 1290 American Beech 1300 Ash 1320 White Oak 1360 Australian Cypress 1375 Hard maple 1450 Wenge 1630 African Pedauk 1725 Hickory/Pecan 1820 Purpleheart 1860 Jarrah 1910 Merbau 1925 Santos Mahogany 2200 Mesquite 2345 Brazilian Cherry 2350