This plow bolt and nut assembly secures the share or other wear part to the plow frog. The bolt passes through the wear part and threads into the nut, clamping the assembly against the frog face. The 10.9 hardness class indicates the bolt is heat-treated for high tensile strength, which is necessary to withstand the shock loads and shear forces encountered during tillage. A loose or failed bolt allows the share to shift, leading to uneven furrow depth and accelerated wear on the frog. On reinstallation, clean the bolt hole and mating surfaces, and tighten the nut to the specified torque.