This study presents a numerical investigation of densified wooden nails as a sustainable fastening solution in timber construction. Using Abaqus finite element software, a detailed model of a glulam timber assembly joined by densified beech nails was developed. The model accounts for material anisotropy, frictional interaction, and load-slip behavior observed in physical testing. Results demonstrate the ability of densified wooden nails to provide sufficient shear resistance and structural integrity while enabling compatibility with wood-based substrates. The numerical predictions are consistent with experimental findings and contribute to the broader application of bio-based fastening systems in both new construction and heritage restoration.