This document, EN 14399:2005, defines the specifications for high-strength structural bolted assemblies. It deals with a broad range of bolted assemblies used in engineering applications. The standard provides methods for the design, fabrication, inspection, and testing of bolted assemblies to ensure their performance. It also specifies the element

DIN 931 outlines the specifications for six-sided head fasteners. These bolts are widely employed in diverse applications, from mechanical engineering tomanufacturing. The DIN 931 standard covers parameters such as diameter and thread pitch. It also defines requirements for material grade and accuracy. Adhering to DIN 931 ensures durable connecti