Which bolt type may be reused if engineer approves?

Which bolt type may be reused if engineer approves?

• A. Galvanized A325
• B. A490
• C. Non-galvanized A325
• D. A307

Answer: (C)

The ability to reuse a bolt hinges on its type, coating, and the engineer’s approval. High‑strength bolts are designed to resist significant loads, and once they’re installed and then removed, their ability to reliably reach the required pretension is compromised unless carefully inspected and tested. Galvanized coatings complicate reuse because removing the bolt damages the coating and can alter threads and surface conditions, making the bolt unreliable for reassembly. If an engineer approves reuse, a non‑galvanized A325 bolt is the most plausible candidate among the options because its uncoated surface allows proper inspection of threads and shank for wear, and, if it still meets length and condition requirements, it can be re-tensioned to the specified load. The other bolt types aren’t suitable for reuse in typical practice: galvanized high‑strength bolts, higher‑strength A490 bolts, and the low‑strength A307 bolts are generally intended to be replaced rather than reused.

The ability to reuse a bolt hinges on its type, coating, and the engineer’s approval. High‑strength bolts are designed to resist significant loads, and once they’re installed and then removed, their ability to reliably reach the required pretension is compromised unless carefully inspected and tested. Galvanized coatings complicate reuse because removing the bolt damages the coating and can alter threads and surface conditions, making the bolt unreliable for reassembly. If an engineer approves reuse, a non‑galvanized A325 bolt is the most plausible candidate among the options because its uncoated surface allows proper inspection of threads and shank for wear, and, if it still meets length and condition requirements, it can be re-tensioned to the specified load. The other bolt types aren’t suitable for reuse in typical practice: galvanized high‑strength bolts, higher‑strength A490 bolts, and the low‑strength A307 bolts are generally intended to be replaced rather than reused.