Generally the following applies: The wood types listed below demonstrate the values cited in the table at wood moisture content of 12%. These values are approximate values, as wood shows deviations in hardness rating depending on it's particular growth characteristics. 

Wood Type	Birnell Hardness n/mmsq	Hardness Rating
Maple	48	4 - very hard wood
Bamboo	40	4 - very hard wood
Europian Maple	27	2 - soft wood
Pearwood	35	4 - very hard wood
Birch	31	2  - soft wood
Beech	34	3 - hard wood
Doussie	40	4 - very hard wood
Oak	34	4 - very hard wood
Ash	41	4 - very hard wood
Fir	12	1 - very soft wood
Jarrah	52	4 - very hard wood
Jabtoba	69	4 - very hard wood
Kempas	52	4 - very hard wood
Nordic Pine	19	2 - soft wood
Cherry	30	3 - hard wood
Siberian Larch	30	2 -  soft wood
Merabu	49	4 - very hard wood
Panga Panga	45	4 - very hard wood
Pitch Pine	33	3 - hard wood
Teak	38	4 - very hard wood
Thermo Oak	32	3 - hard wood
Thermo Ash	31	3 - hard wood
Thermo Spruce	11	1 - very soft wood
Tigerwood	62	4 - very hard wood
Walnut	31	4 - very hard wood
Wenge	45	4 - very hard wood
Zebrano	56	4 - very hard wood