American Black Walnut

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. Walnut is usually supplied steamed, which darkens the sapwood, but a very unique look can also be achieved by leaving it natural. The wood is generally straight-grained, but sometimes with wavy or curly grain that produces an attractive and decorative figure. The dark heartwood will lighten in colour as it ages over time with exposure to UV light.

  • Category
    Timber, Flooring, Timber Decking

Botanical Name
Juglans Nigra L 

Other Names
Black Walnut 

North American

Scope of use


  • Furniture
  • Flooring 


  • Wall/Cladding

Walnut is a tough, hard timber of medium density, with moderate bending and crushing strengths and low stiffness. It works easily with hand and machine tools, and nails, screws and glues well. It holds paints and stains well and can be polished to an exceptional finish. It performs best when dried slowly, reducing the opportunity for degradation. Walnut has good dimensional stability. 

Rated as moderately durable and one of the most durable woods. 

Common Uses
Furniture, cabinet making, architectural interiors, high-class joinery, doors, flooring, gunstocks and panelling. A favoured wood for use in contrast with lighter-coloured timbers.


Dries slowly with a tendency to honeycomb. 

Working Qualities
Typically easy to work provided the grain is straight and regular. Planer tear-out can sometimes be a problem when surfacing pieces with irregular or figured grain. Glues, stains, and finishes well, (though walnut is rarely stained). Responds well to steam bending. 

Furniture, cabinetry, architectural interiors, floors, gunstocks, interior panelling, veneer, turned items, and other small wooden objects and novelties.

Basic Info

Durability In Ground Perishable/Non Durable
Durability Above GroundModerately Durable 

Density Air Dry 600 kg/m3 

Shrinkage Radial 6 %
Shrinkage Tangental 8 % 

Stability Kiln Dry Good Dimension Stability

Mechanical Properties

Janka Hardness 4.5 kN
Modulus of Rupture 101 MPa
Modulus of Elasticity 12 GPa
Max Crush Strength 52 MPa 

ASTM Flame Spread 130-140

Get in touch
ITI Timspec is a wholesaler supplier for the Trade. For all non-trade pricing enquiries, please contact your preferred Timber supply Merchant.
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About the

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Timspec was established in 1990 as a wholesaler of specialty timber and was wholly New Zealand owned. In March 2019 Timspec was acquired by ITI Australia and became ITI Timspec LTD.  

Today we import, export, and wholesale a huge range of timber to builders, joiners, home owners, floor layers, landscape builders and furniture manufacturers. We pride ourselves on being environmentally responsible and strive to source the most sustainable timber options available. Timber stocked includes species from North America, South America, Europe, Africa, South East Asia, Australia, and New Zealand's exotic as well as indigenous species. 

The ITI Timspec team are extremely knowledgeable about the various types of timber, treatments and uses available and are happy to help you in choosing the right product for your project.