This specification, EN 14399:2005, defines the criteria for high-strength structural bolted assemblies. It addresses a wide range of bolted connections used in engineering applications. The standard provides procedures for the design, manufacture, inspection, and testing of bolted assemblies to ensure their safety. It also specifies the components

DIN 931 outlines the specifications for six-sided head fasteners. These fixings are widely employed in diverse fields, from automotive engineering tomanufacturing. The DIN 931 standard covers dimensions such as length and thread type. It also establishes standards for material quality and tolerances. Adhering to DIN 931 ensures durable connection