The standard DIN 7991, also known as ISO 10642, specifies the characteristics of flat countersunk head screws with hexagon socket head cap screws. These screws are commonly used in various industries for applications that require a flush finish. DIN 7991 / ISO 10642 screws are designed to provide a secure and reliable fastening solution, ensuring that components are held together firmly. The standard outlines the dimensions, materials, and tolerances for these screws, making it easier for manufacturers to produce and use them effectively.