DIN 7991 Flat Head Countersunk Screws are fasteners designed with a flat, countersunk head and a fully threaded shaft. The flat head allows these screws to sit flush with the surface when installed, creating a smooth and even appearance. These screws are commonly used in applications where a flush finish is desired, such as in machinery, furniture, and construction projects. The countersunk design also ensures that the screw head does not protrude, reducing the risk of snagging or interference.