DIN 7991 and ISO 10642 are international standards that specify the characteristics of countersunk flat head screws with hexagon socket head. These standards provide detailed specifications regarding the dimensions, materials, and tolerances of the screws, ensuring their compatibility and interchangeability across different manufacturing processes and applications. The standards also cover the technical requirements for the corresponding hexagon socket countersunk head bolts, offering a comprehensive framework for the design and use of these fastening components. By adhering to DIN 7991 and ISO 10642, manufacturers and engineers can achieve consistency and reliability in their products and constructions, ultimately contributing to the overall safety and quality of the end-use applications.