When comparing prices, you must verify the material grade (e.g., Carbon Steel, 40Cr, or Stainless Steel) and the manufacturing process (cold drawn vs. hot rolled). A 12mm tie rod's price is heavily influenced by its tensile strength and thread precision (metric vs. imperial). Ensure the supplier specifies the surface treatment, such as zinc plating, black oxide, or hot-dip galvanizing, as these significantly impact both the cost and the rod's corrosion resistance in construction or automotive applications.