Walnut
(Black Walnut)

Scientific Name: Juglans nigra

General Description
The sapwood of Walnut is creamy white, while the heartwood is light brown to dark chocolate brown, occasionally with a purplish cast and darker streaks.  The wood develops a rich patina that grows more lustrous with age.  Walnut is usually supplied steamed, to darken sapwood.  The wood is generally straight-grained, but sometimes with wavy or curly grain that produces an attractive and decorative figure.  This species produces a greater variety of figure types than any other.

Working Properties
Walnut works easily with hand and machine tools, and nails, screws and glues well.  It holds paint and stain very well for an exceptional finish and is readily polished.  It dries slowly, and care is needed to avoid kiln degrade.  Walnut has good dimensional stability.

Physical Properties
Walnut is a tough hard timber of medium density, with moderate bending and crushing strengths and low stiffness.  It has a good steam bending classification.

Specific Gravity: 0.55 (12% M.C.)
Average Weight: 609 kg/m3 (12% M.C.)
Average Volumetric Shrinkage: 10.2% (Green to 6% M.C.)
Modulus of Elasticity: 11,584 MPa
Hardness: 4492 N

Availability
Reasonable availability with regional limitations, (1.9 percent of total U.S.  hardwoods commercially available).

Main Uses
Furniture, cabinets, architectural millwork, doors, flooring, paneling, and gun stocks.  A favored wood for using in contrast with lighter-colored species.