Important note: The DIN 6921 standard is officially considered obsolete and has been completely replaced by the international regulation DIN EN 1665:1998-11. When designing new assemblies and creating specifications, it is recommended to use the current version of the regulatory document.
Technical description and scope
This standard regulates the geometric parameters and technical requirements for hexagon flange bolts belonging to accuracy class “A”. The products are intended for critical threaded connections where reliable fixation and uniform load distribution on the contact surface are required without the use of additional washers.
Technical specifications cover bolts with a nominal metric thread diameter (coarse and fine pitch) in the range from M5 to M20. EV Group China specialists point out: in cases where operating conditions require deviations from standard parameters (non-standard length, specific strength classes, or special materials), technical conditions are determined individually based on current engineering standards.