DIN 960, ISO 8765, and EN 28765 are three different standards used in the field of engineering and manufacturing. These standards provide guidelines and specifications for various aspects of products and processes. DIN 960 is a German standard that focuses on the design and dimensions of hexagon head screws with fine pitch thread. ISO 8765 is an international standard that specifies the dimensions and tolerances for hexagon socket set screws with flat point. EN 28765 is a European standard that deals with the testing and qualification of welders for fusion welding of metallic materials. Each of these standards plays a crucial role in ensuring quality, compatibility, and safety in different areas of industry.