A DIN 558 Hex Set Screw is a type of screw that has a hexagonal head and fully threaded. The DIN 558 standard specifies the dimensions, tolerances, and material requirements for these bolts, ensuring consistency and quality. Hex screws are commonly used in various applications, including construction, machinery, and automotive components, where a strong and reliable mechanical connection is needed. The DIN 558 standard is typically used with Mild Steel (4.8) Bolts.