This document, EN 14399:2005, defines the requirements for high-strength structural bolted assemblies. It covers a comprehensive range of bolted assemblies used in structural applications. The standard provides procedures for the design, manufacture, EN 14399 inspection, and testing of bolted assemblies to ensure their safety. It also specifies the

DIN 931 defines the standards for six-sided head bolts. These bolts are widely employed in diverse industries, from automotive engineering toassembly. The DIN 931 standard covers sizes such as diameter and thread type. It also establishes criteria for material composition and tolerances. Following DIN 931 ensures durable connections and enhances