Which statement best describes bolts as used in aircraft structures?

• A. Rivets are threaded fasteners used with nuts and torque
• B. Pins are threaded fasteners used with nuts and torque
• C. Bolts are threaded fasteners used with nuts and torque
• D. Bolts are always used without torque

Answer: (C)

Bolts in aircraft structures are threaded fasteners used with nuts and torque to develop a controlled preload that clamps joints firmly under vibration and loads. The torque value ensures the bolt is tightened enough to prevent loosening and to maintain structural integrity through countless cycles. Rivets aren’t threaded and don’t use nuts or torque; pins are typically non-threaded devices for alignment or temporary restraint and don’t rely on torque in the same way. The idea that bolts are used without torque isn’t correct because lacking proper torque means insufficient preload and a higher risk of joint failure.