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Ditta 5
Indirizzo: via dei platani 4 liguria
Tel.: +39 456 5664 54

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Ditta 4
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Ditta 2
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Ditta 1
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Ditta 0
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Nkoba
Nkoba (Baikiaea insignis)

Family: Leguminosae

Common names: Nkoba, Nkobakoba

Distributed in: Tanzania, Uganda (Africa)

Common uses: Agricultural implements, Boat building (general), Cabinetmaking, Carvings, Concrete formwork, Flooring, Flooring: industrial heavy traffic, Furniture, Heavy construction, Joinery, Light construction, Paneling, Piling, Plywood, Railroad ties, Veneer

Product sources: The ITTO reports that timber from this species is produced and exported only in low volumes.

Environment profile: Abundant/Secure

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodWhite, Yellow.The grain isStraight, the textureMediumand the lusterMedium

Natural durability: Susceptible to marine borer attack, Very durable

Odor: Has an odor

LightInduced Color Change: Lighter

Kiln Schedules: UK=D US=T3D2/T3C1

Kiln Drying Rate: Slow (18-28 days for boards < 32 mm, to 52-84 days for boards >= 63 mm)

Drying Defects: Severe twisting/warping, Slight surface checking

Ease of Drying: Slowly

Tree Identification: Bole/stem form is misshapen

Blunting Effect: High to severe

Boring: Moderately easy

Carving: Fair to Good Results

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Finishes satisfactorily

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Fair to Good , Very Good to Excellent

Planing: Fairly Difficult to Very Difficult

Resistance to Impregnation: Sapwood is moderately resistant

Resistance to Splitting: Satisfactory

Response to hand tools: Easy to machine

Routing recessing: Fair to Good Results

Veneering qualities: Suitable for peeling, Suitable for slicing

Screwing: Fair to Good Results, Very Good to Excellent Results; Turning: Fair to Good Results

Painting: Good; Polishing: Good; Staining: Reacts with Iron to discolour wood;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 769 kg/m3
Bending Strength 654 1024 kg/cm2
Crushing Strength 485 699 kg/cm2
Hardness 752 kg
Impact Strength cm
Shearing Strength 124 kg/cm2
Stiffness 140 161 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 3 %
Weight 753 608 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9310 14566 psi
Density 48 lbs/ft3
Hardness 1658 lbs
Maximum Crushing Strength 6899 9945 psi
Shearing Strength 1775 psi
Stiffness 1999 2304 1000 psi
Weight 47 38 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %

Density (dry weight) = 46-52 lbs/cu. ft. 0
Max. crushing strength = high
Bending strength (MOR) = medium
Shrinkage, Radial = small
Shrinkage, Tangential = moderate
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = high
Hardness (side grain) = medium
Shrinkage, Radial = very small
Shrinkage, Tangential = very small
Shearing strength (parallel to grain) = medium
Modulus of Elasticity (stiffness) = medium
Density (dry weight) = 53-60 lbs/cu. ft
Shrinkage, Tangential = small

Banks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Eggeling, W.J.,1940,Indigenous Trees of Uganda,Govt. Printer Entebbe UgandaI.U.F.R.O.,1973,Veneer Species of the World,Assembled at F.P.L. Madison on behalf of I.U.F.R.O. Working Party on,Slicing and Veneer CuttingMurira, K.,1984,Natural Durability Tests of Tanzanian Timbers 1955 - 1982,Tanzania Forestry Research Institute, Timber Utilisation Research Centre,,Moshi.Tack, C.H.,1958,The Strength Properties of some Uganda Timbers,Uganda Forest Department Bulletin No. 5Tack, C.H.,1969,Uganda Timbers,Govt. Printer UgandaTakahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7Tanzania Forest Department,1960,The Natural Durability of Local Timbers,Tanzanian Forest Dept. Tech. Note,No.14Tanzania Forest Division,1966,Kiln Drying Schedules for Tanzania Timbers Technical Note no.38,Tanzania Forest Div. Util. Sec. MoshiTanzania Forestry Department,1961,Timbers of Tanganyika - Baikiaeae insignis,Tanzania Forestry Department, Utilisation Section, Moshi - Timbers of,TanganyikaUganda Forest Department,1969,The Shrinkage of Some Ugandan Timbers,Uganda Forestry Department Timber Leaflet,No.47
*Come interpretare i dati (manleva su eventuali imprecisioni)