The NHLA grading rules differ for walnut from most other species. The rules are more forgiving of knots, wane, and other defects. While the sapwood of walnut is creamy white, the heartwood is light brown to dark brown. Walnut is commonly supplied steamed to darken the sapwood and reduce the contrast. The wood is generally straight grained. It can occasionally contain a wavy or curly grain pattern. Walnut is heavy, hard, and stronger than average. Walnut machines well and is easy to nail and screw.
Availability at Kamps Hardwoods:
Walnut is offered in NHLA grades, 2Com&Btr, as well as proprietary grades. Width sorts in all grades are provided. Color sorts include 90/90+, 90/70+, 90/50+, unselected for color, sappy. Walnut is offered in 3/4, 4/4, 5/4, 6/4, 8/4, 10/4, and 12/4 thickness. All walnut at Kamps is steamed prior to kiln drying.