Botanical Name Juglans nigra Other Names Black walnut Origin Central USA Sapwood Colour Creamy white Heartwood Colour Light brown to dark brown and dark streaks Grain Usually straight occasionally wavy or irregular Texture Uniform but coarse Common Uses Furniture, cabinetry, interior decoration, doors, flooring, panelling Density kg/m3 641 Specific gravity - 0.55 Hardness N 4492 Bending Strength N/mm2 105.2 Stiffness N/mm2 11800 Radial shrinkage % 4 Tangential shrinkage % 7 Working Properties Stability xxx Bending xx Machining xxx Screwing xxx Gluing xxx Painting xxx Sanding xxx Staining xxxx xxxx = excellent xxx = good xx = fair x = not good