Ironwood
Scientific name: Krugiodendron ferreum
Overview
Ironwood (Krugiodendron ferreum) is one of the densest and hardest native hardwoods found in the Caribbean and southern Florida. Despite its relatively small size, it produces an exceptionally heavy and durable wood that has historically been used for applications requiring extreme strength and wear resistance. It is not a commercial lumber species but is highly valued for specialty uses and by collectors.
Quick Facts
- Common Name: Ironwood
- Scientific Name: Krugiodendron ferreum
- Region: Caribbean & West Indies Hardwoods
- Tree Size: 15–50 ft tall, typically under 1 ft trunk diameter
- Average Dried Weight: ~75–85 lbs/ft³ (estimated)
- Janka Hardness: Not officially rated (extremely hard)
- Color: Reddish brown to dark brown
- Grain: Fine, often interlocked
- Texture: Very fine and dense
Identification Characteristics
Ironwood is recognized by its deep coloration, extremely fine texture, and unusually high weight for its size. The wood feels noticeably heavy even in small pieces.
Key identification traits include:
- Reddish brown to dark brown heartwood
- Extremely dense and heavy
- Fine, tight grain with subtle interlocking
- Smooth, almost polished appearance when finished
Working Properties
Ironwood is very difficult to work due to its extreme density, but it performs exceptionally well in applications where durability is critical.
- Very hard to cut and machine
- Excellent for turning and fine detail work
- Holds edges extremely well
- Can dull tools quickly
Safety Note
No widely reported toxicity, but due to its density and hardness, fine dust can be produced during machining—proper respiratory protection is recommended.
Common Uses
Ironwood is used in specialized applications where strength, durability, and wear resistance are essential.
- Tool handles
- Turned objects
- Walking sticks
- Small mechanical components
- Decorative items
Sustainability & Notes
Ironwood is not commercially harvested due to its small size and limited availability. It is often protected in parts of its native range, particularly in sensitive ecosystems like the Florida Keys. Its rarity in lumber form makes it more significant as a botanical and collector species than a commercial one.
Comparative Notes & Related Species
Lignum Vitae – Similar extreme density and durability, but larger and historically more widely used.
Black Torch – Another small Caribbean species with very high density, though typically darker and less available.
Wamara – A dense South American hardwood, but generally more workable and available in larger sizes.
Related Guides
Preventing Tear-Out in Interlocked Grain – Useful for working with dense woods like Ironwood that often have interlocked grain.
Understanding CITES & Protected Species – Provides context on restricted or protected hardwoods, relevant to rare species like Ironwood.
FSC Certification Explained – Explains how sustainability certifications apply to tropical and protected 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
Ironwood is a standout collector species due to its extreme density and rarity in usable sizes. Even small samples are highly valued, especially when well-finished to highlight its fine texture and deep color. It is an essential addition to any collection focused on the hardest and heaviest woods in the world.
Share Your Photos of This Species
Do you have lumber, wood samples, tree photographs, woodworking projects, furniture, carvings, turnings, musical instruments, or other items made from this species?
Exotic Woods of the World welcomes photographs from woodworkers, collectors, sawyers, researchers, and wood enthusiasts around the world. Selected submissions may be featured on this page and throughout our website to help document and showcase real-world examples of this species.
When submitting photos, please include the common name, scientific name (if known), a brief description, and any information you would like us to share with the image.
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.
Lumber Suppliers:
Availability varies — see the Where to Buy Exotic Woods page for current sources.
Related Tools & Products:
Availability varies — see the Where to Buy Exotic Woods page for current sources.
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