DIN 961 specifies the design and dimensions for metric hexagon flange bolts with fine pitch thread. These bolts are designed to provide secure and stable fastening in various industrial and mechanical applications. The standard outlines the requirements for the physical geometry of the bolts, such as the diameter, length, pitch, and thread length, ensuring interchangeability and compatibility with corresponding mating parts. Additionally, DIN 961 addresses the material and mechanical properties of the bolts, ensuring their strength, durability, and reliability under various operating conditions. Overall, this standard plays a crucial role in promoting the uniformity and quality of metric hexagon flange bolts, contributing to the safety and efficiency of mechanical and industrial systems.