DIN 912 specifies the type of screws known as Hexagon Socket Head Cap Screws. These screws are designed with a hexagonal socket in the head, allowing for easy tightening and loosening using a hex key or Allen wrench. The term "socket head" refers to the shape of the screw head, which is cylindrical with a recessed hexagonal socket. The screws are commonly used in various applications where a secure and tight fastening is required. The DIN 912 standard ensures that these screws meet specific dimensional and performance requirements, making them a reliable choice for many industries and applications.