DIN 931 and ISO 4014 are two different standards that pertain to fasteners, specifically hexagon head bolts with partial threads. These standards outline the specifications and dimensions for these bolts, ensuring uniformity and compatibility across different industries and applications. While both standards serve the same purpose, they may have slight variations in terms of tolerances, materials, and other technical details. It is important to adhere to these standards when selecting and using these bolts to ensure proper fit, functionality, and safety in various engineering and construction projects.