This document, EN 14399:2005, defines the specifications for high-strength structural bolted assemblies. It deals with a comprehensive range of bolted assemblies used in civil applications. The standard establishes procedures for the design, production, inspection, and testing of bolted assemblies to ensure their reliability. It also specifies the

DIN 931 defines the requirements for hex head bolts. These nuts are widely employed in numerous fields, from mechanical engineering toconstruction. The DIN 931 standard covers dimensions such as length and thread type. It also defines standards for material composition and precision. Adhering to DIN 931 ensures durable connections and boosts the