DIN 7990 Hexagon head bolts for steel structures

DIN 7990 is a German standard that specifies the technical requirements for hexagon fit bolts with large width across flats and small head height. These fit bolts are used in structural steelwork and provide a secure and stable connection for various construction and engineering applications. The standard ensures that these bolts meet specific dimensional and performance criteria and play a crucial role in ensuring the structural integrity and safety of the assembled components. DIN 7990 hexagon fit bolts are characterized by their large width across flats, which provides ample surface area for distributing the applied load and helps prevent bolt loosening under dynamic or vibrational stress. The small head height of these bolts allows for a flush fit when installed, contributing to the overall aesthetic and functional requirements of the assembled components. The standard covers a range of sizes and dimensions for hexagon fit bolts, encompassing diameters ranging from M16 to M36, with lengths varying to accommodate specific structural requirements. These dimensions are carefully stipulated to ensure that the fit bolts can effectively withstand the loads and forces they are subjected to, providing stability and reliability in various structural steelwork applications. In addition to outlining dimensional requirements, DIN 7990 also addresses material specifications and performance characteristics. Hexagon fit bolts are typically manufactured from high-strength steels, with specific mechanical properties and material grades detailed in the standard to ensure their strength, ductility, and suitability for structural applications. It is important to note that the standard also aligns with international standards established by the International Organization for Standardization (ISO). The corresponding ISO standard for hexagon fit bolts is ISO 7412, which provides internationally recognized requirements for these critical fasteners. This alignment ensures that hexagon fit bolts manufactured according to ISO 7412 conform to globally accepted standards for quality, dimensions, and material properties, facilitating their use in diverse markets and applications worldwide. DIN 7990 ISO 7412 hexagon fit bolts play a vital role in providing secure and stable connections in structural steelwork, contributing to the integrity and safety of various construction projects.