Fees from the sale of specifications fund ongoing research into steel construction safety and efficiency. By purchasing or accessing via an institutional subscription, you support the next edition’s development.

The NSSS has evolved over decades. The 5th Edition was widely used during the transition from British Standards (BS 5950) to Eurocodes. The 6th Edition bridged the gap between legacy standards and modern performance-based requirements. The represents a full maturation into the Eurocode era, with increased emphasis on digital fabrication, sustainability, and rigorous quality management (ISO 9001).

One of the most technically demanding sections of the NSSS concerns geometric tolerances. Steel structures rely on precise alignment to transfer loads effectively and to interface with other building components, such as cladding and lifts. The 7th Edition rigorously defines two types of tolerances: and manufacturing tolerances .