1. DIN 7991/ISO 10642 is a standard that specifies the characteristics of countersunk socket head screws with hexagon socket and flat head. These screws are commonly used in applications where a smooth and flush finish is required, such as in machinery, equipment, and automotive industries. The dimensions and tolerances outlined in this standard ensure that the screws meet the necessary requirements for their intended use, providing a reliable and secure fastening solution. It is essential for manufacturers and engineers to adhere to this standard to ensure the quality and consistency of their products.