BS 7419 is a British Standard specification that delineates the requirements for square head bolts with hexagon or square nuts, specifically designed for structural steel bolting purposes. This standard covers aspects such as dimensions, tolerances, material composition, mechanical properties, and the coating for corrosion protection, ensuring that the bolts produced under this specification meet the necessary quality and performance criteria for their intended use in structural applications. By adhering to BS 7419, manufacturers and engineers are provided with a guideline that promotes consistency, reliability, and safety in the construction and engineering sectors. This standard applies to bolts intended for use in environments where a robust connection is essential, such as in the construction of bridges, buildings, and other structures where structural integrity is paramount.