DIN 961 is a standard that specifies the requirements for metric hexagon head bolts with fine pitch thread. This standard provides detailed guidelines for the dimensions, materials, and mechanical properties of these bolts. It ensures that the bolts meet the necessary quality and performance standards for various applications. DIN 961 is widely recognized and used in industries where precision and reliability are crucial, such as automotive, aerospace, and machinery. By adhering to this standard, manufacturers can ensure the compatibility and interchangeability of these bolts, making them an essential component in many engineering and construction projects.