Variations within species and grades: Significant color variation between boards.
Hardness (Janka): 950; 26% softer than Northern red oak.
Dimensional Stability: Above average (change coefficient .00248; 33% more stable than red oak).
Durability: Strong, moderately hard; excellent shock resistance. Usually considered too soft for an entire floor — mostly used for borders and accents.
Sawing/Machining: Good machining qualities.
Sanding: Sands satisfactorily.
Nailing: Good holding ability.
Finishing: No known problems.
Comments: High in bending strength. Light-sensitive; strong color change upon exposure to light.
Information is from The National Wood Flooring Association
"Wood Species Used in Wood Flooring"