Traditionally, the design of silos was carried out using classical theories. Hence, it is possible to find data on many granular agricultural materials for all the material properties considered in these theories. Nevertheless, the application of numerical methods to silo design is relatively recent. With these methods, new material properties are needed, in addition to the ones considered in classical theories, in order to estimate grain loads inside silos. As there is a lack of these new parameters in the existing literature, the goal of this research was to provide values of all material properties needed in silo design for several granular agricultural materials. These values can be applied to the design of silos using numerical methods.