Janka Hardness Ratings for Various Species of Wood (pounds)

Hardness is defined as resistance to indentation using a modified Janka hardness test, measured by the load required to embed a 11.28-mm (0.444-in.) ball to one-half its diameter. Values presented are the average of radial and tangential penetrations.(1)

  • Purpleheart 1,860 lbs
  • Angelim Pedra, Brazilian Apitong 1,720 lbs
  • Gerutu 1,520 lbs
  • Apitong, Keruing 1,520 lbs
  • White Oak 1,360 lbs
  • Red Oak 1,290 lbs
  • Douglas Fir 660 lbs
  • Western Red Cedar 350 lbs

(1) The Wood Handbook - Wood as an engineering material, USDA, General Technical Report 113.