Which standard must heavy-hex nuts comply with?

Heavy-hex nuts must comply with the A563 standard. This standard specifically outlines the requirements for carbon and alloy steel nuts, including heavy-hex nuts, used in structural steel applications. It covers various aspects such as chemical composition, mechanical properties, and dimensions, ensuring the nuts meet the necessary criteria for strength and performance when used in conjunction with bolts.

Furthermore, compliance with A563 helps guarantee that the nuts will adequately respond to the stresses and loads encountered in structural applications, which is crucial for the overall integrity and safety of a structure. The standard also specifies class designations for different grades of nuts, allowing for the appropriate selection depending on the application and the bolting being used. Thus, understanding and adhering to A563 is essential for ensuring that heavy-hex nuts fulfill their intended mechanical functions reliably in structural systems.