Which standards must approved alternative design fasteners meet?

Approved alternative design fasteners, when used in structural applications, must adhere to recognized standards that ensure their quality and performance. The correct choice highlighting ASTM A490 and A325 reflects the rigorous testing and specifications these fasteners must meet.

ASTM A325 covers the specifications for structural bolts and their associated nuts, providing detailed criteria regarding the mechanical properties, manufacturing methods, and physical characteristics necessary for their safe performance in steel structures. Similarly, ASTM A490 specifies the requirements for high-strength bolts allowing for reliable and consistent performance under structural loads. Both sets of standards aim to guarantee the integrity of the connections formed by these fasteners, maintaining safety and compliance in construction practices.

The other options include standards that may be relevant in other contexts, such as general manufacturing or specific quality management systems, but they do not specifically address the criteria for structural fasteners as directly as ASTM A490 and A325. Therefore, meeting the requirements of these ASTM standards is crucial for ensuring that any approved alternative design fasteners are reliable and effective for use in structural steel applications.