Narrow-Leaved Ironbark
Scientific name: Eucalyptus crebra
Overview
Narrow-Leaved Ironbark (Eucalyptus crebra) is a small to medium-sized tree native to eastern Australia, extending from central New South Wales through Queensland to Cape York Peninsula. It is recognized by its hard, deeply furrowed dark ironbark, narrow gray-green leaves, and exceptionally dense red-brown timber. The wood has long been valued for structural work, poles, bridges, flooring, and other applications demanding strength, hardness, and natural durability.
Quick Facts
- Common Name: Narrow-Leaved Ironbark
- Alternate Common Name(s): Narrow-Leaved Red Ironbark, Red Ironbark, Muggago
- Scientific Name: Eucalyptus crebra
- Region: Oceania & Pacific Woods
- Tree Size: Up to approximately 115 ft (35 m) tall
- Average Dried Weight: Approximately 68 lb/ft³ (1,090 kg/m³)
- Janka Hardness: Approximately 12.0 kN (about 2,700 lbf)
- Grain: Straight to interlocked
- Texture: Fine and even
Identification Characteristics
Narrow-Leaved Ironbark combines persistent blackish ironbark with a crown of narrow dull leaves. Its small buds and cup-shaped to barrel-shaped fruit help distinguish it from other eastern ironbarks.
Key identification traits include:
- Hard, deeply furrowed dark gray to black ironbark extending onto smaller branches
- Linear to narrowly lance-shaped dull green or gray-green adult leaves
- Small white flowers, usually in clusters of 7, 9, or 11
- Small cup-shaped, hemispherical, or barrel-shaped fruit
- Dark red-brown, very hard and heavy heartwood with fine texture
Working Properties
This is an extremely hard, heavy timber that demands sharp tools, strong machinery, and controlled feed rates. Its density and occasional interlocked grain can make machining slow, but properly prepared material produces exceptionally durable surfaces.
- Use sharp carbide tooling and expect substantial cutting resistance.
- Pre-drill for screws, nails, and larger fasteners.
- Interlocked grain can tear during planing; use light cuts and careful grain reading.
- Dense stock can generate heat quickly and dull cutters.
- Finishes to a smooth, hard-wearing surface after thorough sanding.
Safety Note
Avoid breathing dust produced during sawing, routing, turning, or sanding. Use effective extraction, respiratory and eye protection, and wash exposed skin after handling. The timber’s extreme hardness also increases kickback and heat risks when tools are dull or feed rates are inappropriate.
Common Uses
The timber is used where high strength, abrasion resistance, and natural durability are essential.
- Bridges, wharves, poles, and heavy engineering
- Railway sleepers and structural members
- Decking and exterior construction
- Hard-wearing flooring
- Furniture, turning, and salvaged-timber projects
- Fence posts and fuelwood
Sustainability & Notes
Narrow-Leaved Ironbark remains widespread across eastern Australia, but responsible sourcing still matters because mature trees grow slowly and durable timber can remain in service for generations. Reclaimed bridge, wharf, pole, and farm timber is especially valued. Buyers should favor legally harvested, certified, plantation-grown, or well-documented salvaged material.
Comparative Notes & Related Species
- Grey Ironbark – A closely comparable ironbark with similarly dense, durable timber but differences in leaf, bud, fruit, and wood coloration.
- Forest Red Gum – Another dense eastern Australian red timber, useful for comparing bark type, hardness, and structural use.
- Blackbutt – A lighter major structural hardwood that provides a useful contrast in density, workability, and appearance.
- Spotted Gum – A durable Australian construction timber with smoother mottled bark and generally easier machining.
Related Guides
- Eucalyptus Species Overview – Compare Narrow-Leaved Ironbark with other eucalyptus species and review the identification features shared across the group.
- Oceania & Pacific Woods – Explore hardwoods native to Australia, New Zealand, and neighboring Pacific regions.
- Understanding Interlocked vs. Straight Grain – Learn how grain direction affects machining, strength, figure, and surface quality.
- Preventing Tear-Out in Interlocked Grain – Review practical techniques for cleaner planing and routing of reversing grain.
- Plantation vs. Wild-Harvested Hardwoods – Understand how timber origin affects availability, growth characteristics, sustainability, and sourcing.
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
A documented sample is particularly valuable when it includes face grain, end grain, sapwood contrast, geographic origin, and whether the timber was newly milled or reclaimed. The extreme weight, dark red-brown color, and fine texture make Narrow-Leaved Ironbark an important reference among Australian structural hardwoods.
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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.
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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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