The flexural properties of two matched samples of 2x4 spruce-pine-fir lumber "No.1 and better" grades were compared. The only difference in testing these two samples was that one was tested at a rate of deformation of 0.5 inch/min. and the other tested at a rate of 60 inches/min. Results indicate that there were no statistically significant differences in Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) between the two samples; however, Stress at Proportional Limit (SPL) was significantly different. Two linear models relating MOR to MOE were fitted to the data for both rates of straining, and it was found that these two models were not significantly different. The differences in MOE, MOR, and SPL between the two samples were more pronounced in stronger specimens than in weaker ones.