Oak wood has a modulus of elasticity of around 800,000 to 1,400,000 pounds per square inch (or psi). We can obtain pieces of lumber from white and mixed oaks that can have a modulus of elasticity from 800,000 to 1,100,000 psi. While lumbers from red oak can have around 1,000,000 up to 1,400,00 psi of stiffness. Read more