Quality control can be improved for hardware die casting mold products by adopting some practices, such as: using high-quality and compatible materials for the hardware products and the die casting mold, optimizing the design and structure of the hardware products and the mold cavity to reduce defects and errors, applying proper coatings or treatments to the hardware products’ surface to enhance their appearance and protection, using statistical process control (SPC) to monitor and control the variation of the die casting process, and implementing continuous improvement (CI) to identify and eliminate.