Janka Wood Hardness Scale

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Janka Wood Hardness Scale The Janka rating is a measure of the amount of force required to push a .444" diameter steel ball half way into a piece of wood. In laymans terms it is a way to measure a woods resistance to denting. It is not productive to take issue with the exact number, but rather understand the "relative" hardness of one wood to another. I say this because I know from experience that two pieces of the same type of wood, one grown quickly further south and one slowly in more northern climates will have quite different Janka ratings, just because of their individual "speed of growth"... and you certainly can't ask a wholesaler for a chunk of wood that grew on the 72nd parallel. Thus a common use of the Janka Hardness Scale is to determine a woods suitabliity as a wood for hardwood flooring. The higher the number the greater its resistance to denting as it lives life. California Redwood 420 Douglas Fir 660 Southern Yellow Pine (loblolly & short leaf) 690 Honduran Mahogany 800 African Mahogany 830 South American Lacewood 840 Southern Yellow Pine (longleaf) 870 Black Cherry 950 American Black Walnut 1010 American Black Walnut Hardwood Flooring Peruvian Walnut 1080 Brazilian Eucalyptus 1125 Teak 1155 Bamboo (carbonized) 1180 Larch 1200 Heart Pine 1225 Caribbean Heart pine 1240 Yellow Birch 1260 Red Oak (Northern) 1290 American Beech 1300 Ash 1320 White Oak 1360 Australian Cypress 1375 Bamboo (natural) 1380 Royal Mahogany 1400 Hard maple 1450 African Walnut/Sappelle 1500 Brazlian Maple 1500 Zebrawood 1575 Wenge 1630 Brazilian Oak 1650 Bamboo 1650 Patens 1691 Peruvian Maple 1700 Kempas 1710 African Pedauk (Padeuk/African Cherry) 1725 Bolivian Rosewood /Morado 1780 Hickory/Pecan 1820 Kempas 1854 Purpleheart 1860 Jarrah 1910 Amendoim 1912 Merbau 1925 .

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Oak, Pine & Hemlock Silviculture
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