Ponderosa pine
Pinus ponderosa
Ponderosa pine measures 460 lbf on the Janka scale, about 36% as hard as northern red oak.
- It is soft and steady at once, in the lowest quarter of the list for both hardness and shrinkage across the face.
- Light red meranti has exactly the same Janka figure.
- Across all 155 woods it falls in the bottom fifth for hardness, density, bending strength, stiffness, face shrinkage and volumetric shrinkage.
U.S. hardwoodsU.S. softwoodsImported woodsNorthern red oak
Six measures
Ponderosa pineU.S. softwoods medianOther woods
Janka hardness
460 lbf2,046 N21st softest of 15525th of 37 U.S. softwoods240 lbf3,680 lbfStiffness
1.29 M psi8.9 GPa26th most flexible of 1550.54 M psi4.06 M psiShrinkage across the face
6.2%radial 3.9%26th lowest of 1553.5%12.7%Bending strength
9,400 psi64.8 MPa27th weakest of 1554,300 psi29,900 psiDensity
0.380.40 at 12% MC28th lightest of 1550.250.96Cupping tendency
1.5939th lowest of 1551.092.90
How much it moves
Little movement, and evenly split between the two directions: one of the steadiest woods in the tables.
0.37 in.
off a 6-inch flatsawn board, green to oven-dry; quartersawn 0.23 in.
- Tangential
- 6.2%
- Radial
- 3.9%
- Volume
- 9.7%
- T/R ratio
- 1.59 (39th most stable of 155)
End view, shrinkage drawn 3× life size.
Closest substitutes
- Lodgepole pine
4% harder · same density · shrinks 0.5 points more across the face
- Jack pine
24% harder · 5% heavier · shrinks 0.4 points more across the face
- Engelmann spruce
15% softer · 13% lighter · shrinks 0.9 points more across the face
Among the pines
10th hardest of 13, lbf; the neighbours either side are shown, the rest are on the pines page.
Laboratory values
| Property | Green | Dry, 12% MC | Change when dried | Metric, 12% MC |
|---|---|---|---|---|
| Impact bending | 21in. | 19in. | −10% | 483mm |
| Side hardness | 320lbf | 460lbf | +44% | 2,046N |
| Work to maximum load | 5.20in-lbf/in³ | 7.10in-lbf/in³ | +37% | 49kJ/m³ |
| Modulus of elasticity | 1.00M psi | 1.29M psi | +29% | 8.89GPa |
| Modulus of rupture | 5,100psi | 9,400psi | +84% | 64.8MPa |
| Compression parallel to grain | 2,450psi | 5,320psi | +117% | 36.7MPa |
| Shear parallel to grain | 700psi | 1,130psi | +61% | 7.80MPa |
| Compression perpendicular | 280psi | 580psi | +107% | 4.00MPa |
| Tension perpendicular | 310psi | 420psi | +35% | 2.90MPa |
Wood Handbook Table 5-3b, Table 4-3. Data & method · Guides