EN 14399 is a standard that addresses the requirements for the preloading of high-strength structural bolting assemblies. It provides guidelines for the use of suitable methods and tools, as well as the appropriate preloading forces. This standard aims to ensure the safe and efficient assembly of steel structures by outlining the necessary steps to achieve the proper preloading of structural bolting assemblies. Additionally, it emphasizes the importance of proper installation and maintenance to guarantee the integrity and reliability of the assembled structures. By adhering to the requirements set forth in EN 14399, engineers and construction professionals can enhance the quality and safety of steel structures, ultimately contributing to the overall integrity of the built environment.