Nato
Scientific name: Mora excelsa
Overview
Nato is one of the most durable and structurally capable hardwoods native to northern South America. Found primarily in Guyana, Suriname, French Guiana, and portions of the Amazon region, Nato is highly regarded for its exceptional strength, density, and resistance to decay. The wood has long been used in heavy construction, marine applications, bridges, industrial flooring, and other demanding environments where long service life is essential.
Although less well known than species such as Ipe or Greenheart, Nato has earned a reputation among engineers, builders, and woodworkers as one of South America’s premier heavy-duty hardwoods.
Quick Facts
- Common Name: Nato
- Scientific Name: Mora excelsa
- Region: South American Hardwoods
- Tree Size: 100–150 ft tall, 3–6 ft trunk diameter
- Average Dried Weight: 66 lbs/ft³
- Janka Hardness: 2,940 lbf
- Color: Reddish brown to dark brown
- Grain: Interlocked to irregular
- Texture: Medium to coarse
Identification Characteristics
Nato is characterized by its dense structure, dark coloration, and exceptional weight. The wood often exhibits a rich reddish-brown appearance that darkens with age and exposure.
Key identification traits include:
- Reddish brown to dark brown heartwood
- Extremely dense and heavy
- Interlocked to irregular grain
- Medium to coarse texture
- Excellent natural durability
- High resistance to wear and decay
Working Properties
Nato can be challenging to machine because of its density and interlocked grain, but it rewards careful workmanship with exceptional durability.Carbide tooling is often recommended when working with Nato.
- Difficult to machine due to density
- Can dull cutting tools quickly
- Good turning characteristics
- Excellent holding strength for fasteners
- Finishes well when properly prepared
- Interlocked grain may produce tear-out
Safety Note
No significant toxicity concerns have been widely reported for Nato. Standard dust collection and respiratory protection should be used when machining or sanding the wood.
Common Uses
Nato is frequently selected for applications requiring maximum strength and durability.
- Heavy construction
- Bridges Marine pilings
- Docks and piers
- Industrial flooring
- Railroad ties
- Utility structures
- Exterior joinery
- Heavy timbers
- Decking
Sustainability & Notes
Nato is an important commercial timber species throughout portions of northern South America. Because the trees can attain large sizes and produce highly durable lumber, the species remains valuable for both domestic and export markets.
Its combination of strength, decay resistance, and longevity has made it a preferred choice for projects where long-term performance is more important than decorative appearance.
Comparative Notes & Related Species
Greenheart – Another legendary South American hardwood known for exceptional durability and marine performance.
Ipe – A dense tropical hardwood widely used for decking and outdoor construction.
Tachi Preto – A heavy-duty South American species valued for strength, durability, and structural applications.
Related Guides
Best Woods for Outdoor Use – Explore hardwood species that excel in exterior environments where moisture, weather, and decay resistance are critical.
Understanding Wood Strength: What Makes Wood Strong? – Learn how density, grain structure, and cellular composition contribute to the exceptional strength of woods such as Nato.
Machining Dense Tropical Hardwoods – Discover techniques, tooling recommendations, and best practices for working with some of the world’s heaviest hardwood species.
Compare Wood Properties
See how this species ranks in density and hardness using our Wood Density & Janka Hardness Chart. You can also explore Hardest Woods, Softest Woods, and Most Dense Woods for quick comparisons.
Collector Notes
Nato is an outstanding collector species for those interested in the world’s strongest and most durable hardwoods. Its impressive weight, rich coloration, and engineering reputation make it an excellent companion specimen to Greenheart, Ipe, Massaranduba, and other heavy tropical hardwoods. Many collectors consider Nato one of South America’s most underrated structural woods.
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Wood Sample Collection
This species is part of an ongoing effort to document and preserve wood samples from around the world.
Learn more about contributing to the collection:
Resources
Authoritative botanical and forestry references used in compiling information about this species include:
• USDA Forest Service – Wood Handbook: Wood as an Engineering Material
https://www.fpl.fs.usda.gov/products/publications/
• The Wood Database – Global reference for wood identification, physical properties, and woodworking characteristics
https://www.wood-database.com/
• Royal Botanic Gardens, Kew – Plants of the World Online – Botanical taxonomy and species distribution database
https://powo.science.kew.org/
• International Union for Conservation of Nature (IUCN Red List) – Global conservation status assessments
https://www.iucnredlist.org/
• Convention on International Trade in Endangered Species (CITES) – International trade regulations for protected plant species
https://cites.org/
Additional forestry publications, academic research papers, and regional timber studies may also be referenced where available.
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Availability & Where to Buy
Exotic hardwood availability can vary significantly depending on region, sustainability regulations, and supplier inventory.
As this archive grows, recommended suppliers and specialty wood retailers will be listed here to help woodworkers locate responsibly sourced material.
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