DIN 558 is a pivotal standard that outlines the fundamental guidelines for technical drawings in the German-speaking world. It serves as a crucial framework for ensuring consistency, clarity, and legibility in technical illustrations. This norm provides comprehensive specifications on elements such as line types, symbols, dimensions, and annotation

DIN 6921 outlines the specifications for hexagon flange bolts in metric sizes. These bolts are commonly used in a wide range of applications, including automotive engineering, due to their high strength and reliable clamping force. The standard specifies dimensional parameters such as thread diameter, bolt length, head size, and flange dimensions.