What is true regarding the reuse of high-strength bolts?

The statement that A490 bolts and galvanized A325 bolts shall not be reused is accurate because of the specific requirements associated with high-strength bolting. A490 bolts have stringent strength characteristics, and reusing them can compromise their integrity and the overall safety of the bolted connection. When these bolts are reused, there is a risk that they may not achieve the required tension due to potential wear, deformation, or other factors that affect their load-bearing capabilities.

Similarly, galvanized A325 bolts are subjected to a coating process that can alter their mechanical properties and reduce their effectiveness when reused. Because of the risk of reduced strength and safety associated with reused bolts, best practices and prescribed codes such as the American Institute of Steel Construction (AISC) guidelines recommend against reusing these specific types of bolts.

In contrast, while A325 bolts can sometimes be reused under certain conditions, it is not universally applicable, and therefore, the safest approach is to not reuse bolts that could compromise the structural performance. This understanding is crucial for ensuring the safety and reliability of steel structures.