Species Strength Information

Thickness of Timbers Needed to Equal Strength of Northern Red Oak Timber, 12 inches Thick

Species
Thickness (inches) needed to equal
stiffness of Northern Red Oak
timber 12 inches thick
Thickness (inches) needed to equal
breaking load of Northern Red Oak
timber 12 inches thick
E. Cottonwood
13.20
15.55
American Elm
13.29
12.59
Slippery (Red) Elm
12.80
12.60
White Ash
12.17
11.77
Red Maple
12.41
12.45
Northern Red Oak
12.00
12.00
Hackberry
13.81
13.70

Strength Properties of Several Hardwood Species

Species
MOE
(x 106 lbf/in2)
MOR
(lbf/in2)
Compression Perpendicular
to Grain (lbf/in2)
Side Hardness (lbf)
E. Cottonwood
1.37
8,500
380
430
American Elm
1.34
11,800
690
830
Slippery (Red) Elm
1.49
13,000
820
860
White Ash
1.74
15,000
1,160
1,320
Red Maple
1.64
13,400
1,000
950
Northern Red Oak
1.82
14,300
1,010
1,290
Hackberry
1.19
11,000
890
880

Source: USDA-Forest Service. 1999. Wood Handbook - Wood as an Engineering Material. Forest Products Laboratory General Technical Report FPL-GTR-113.
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