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KoaKoaKoaKoaKoaKoa
Koa (Acacia koa)

Family: Leguminosae

Common names: Koa

Distributed in: Hawaii [US] (Oceania and S.E. Asia)

Distribution overview: Found exclusively on the Hawaiian Islands, Koa trees reach a height of 100 feet with a diameter of 4 feet. It grows at most elevations on the islands, but grows best in areas of heavy rainfall form 3,000 to 6,000 feet. It is the most conspicuous tree growing between the low, open dry forest and the wet ohia forest, and is generally quite adaptable to a variety of climates.

Common uses: Bent Parts, Boat building, Building materials, Canoes, Core Stock, Decorative veneer, Drum sticks, Excelsior, Figured veneer, Gunstocks, Interior construction, Joinery, Lifeboats, Musical instruments , Novelties, Organ pipes, Paneling , Piano keys, Pianos , Plain veneer, Rifle stock, Shipbuilding, Sounding boards, Sporting Goods, Veneer, Violin bows, Violin, Wainscotting, Xylophones

Product sources: Supplies of Koa are available on the U.S. market in the form of lumber and veneers. Prices are in the high range.

Environment profile: Status has not been officially assessed

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isWhite, Yellowand the sapwoodPale brown, Red.The grain isWith distinct light and dark bands, the textureMedium coarse to coarseand the lusterHigh

Natural durability: Perishable, Very little natural resistance

Odor: No specific smell or taste

Kiln Schedules: Schedule F (4/4) United Kingdom

Drying Defects: Checking, Surface checks

Ease of Drying: Reconditioning Treatement

Comments: Excellent for musical instruments because of its high resonant properties. Hawaiian ukeleles are made exclusively from koa wood. Trees that grow at high exposed areas produce the best figured wood, and the veneer form of Koa is highly valued for fine furniture because of its fiddleback figure and high finish it takes. Koa wood is similar to Black walnut (Juglans nigra)

Blunting Effect: Moderate

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Fairly Difficult to Very Difficult to saw

Gluing: Poor to Very Poor Results Gluing properties are variable, but they are generally poor

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Fairly Easy to Very Easy, Satisfactory nailing properties

Planing: Fairly Easy to Very Easy

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Responds Readily

Routing recessing: Fairly Easy to Very Easy

Screwing: Fair to Good Results, Fairly Easy to Very Easy; Turning: Fairly Easy to Very Easy

Polishing: Very Good to Excellent; Staining: Very Good to Excellent; Varnishing: Very well;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,54
Density 592 kg/m3
Bending Strength 519 789 kg/cm2
Crushing Strength 259 459 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength 116 kg/cm2
Stiffness 90 106 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 7389 11226 psi
Density 37 lbs/ft3
Maximum Crushing Strength 3695 6537 psi
Shearing Strength 1662 psi
Stiffness 1293 1520 1000 psi
Specific Gravity 0.54
Weight 39 32. lbs/ft3

Weight = high
Density = high
Compression strength (parallel to grain) = high
Bending strength (MOR) = high

Boone, R.S., C.J. Kozlik, P.J. Bois and E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. USDA, Forest Service, Forest Products Laboratory, General Technical Report FPL-GTR-57, Madison, Wisconsin.Constantine, Jr. A.J. 1975. Know your Woods: A Complete Guide to Trees, Woods, and Veneers. Revised Edition. Revised by Harry J. Hobbs. Charles Scribner and Sons, New York.Imported Wood Purchasing Guide: A Comprehensive Purchasing Reference for Imported Woods. 1992. 20th Edition. International Wood Trade Publication, Inc. 1235 Sycamore View, Box 34908, Memphis Tennessee.Kaiser, J.1990. Wood of the Month:Koa - The Wood from the Hawaiian Islands.Wood & Wood Products, January 1990, Page 48.Keating, W.G., Bolza, E.,1982,Characteristics properties and uses of timbers. South East Asia, Northern,Australia and the Pacific,C.S.I.R.O. Div. Chemical Technology,Inkata Press,1Kline, M. 1982. Acacia koa - Koa. In A Guide to Useful Woods of the World. Flynn Jr., J.H., Editor. King Philip Publishing Co., Portland, Maine. 1994. Page 12.Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.
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