There is no place for mild steel fasteners for any type of rigging or truck/car bodybuilding application. You must use high tensile steel fasteners. What is high tensile steel? High tensile steel is a steel alloy made to much more stringent steelmaking process than mild steel. Mild steel is typically iron with a small amount of carbon (0.25%). Typically high tensile steel is more than twice as strong as low-carbon mild steel for the same size bolt.
