Variations within species and grades: Sometimes confused with hickory; the zone of large pores is more distinctive in ash, similar to that of red oak.
Hardness (Janka): 1320; 2% harder than Northern red oak.
Dimensional Stability: Above average (change coefficient .00274; 26% more stable than red oak).
Durability: Elastic, hard; excellent shock resistance. Remains smooth under friction.
Sawing/Machining: Good machining qualities.
Sanding: Sands satisfactorily.
Nailing: Good holding ability; good resistance to splitting.
Finishing: No known problems. Stains well.
Information is from The National Wood Flooring Association
"Wood Species Used in Wood Flooring"