Which tool would you use to tighten bolts to a precise torque value?

• A. Socket wrench
• B. Hex key wrench
• C. Torque wrench
• D. Backup wrench

Answer: (C)

Tightening bolts to a specific value requires controlling the clamping force, and a torque wrench is built for exactly that purpose. It lets you set the desired torque and provides a clear indication (a click, a reading, or a display) when that value is reached, so you stop precisely at the target. This prevents under-tightening, which can allow movement, and over-tightening, which can strip threads or crush the joint. The other tools serve different functions: a socket wrench helps apply torque but doesn’t indicate when you’ve reached the target; a hex key wrench turns hex fasteners but provides no torque measurement; a backup wrench holds the opposite side to prevent turning, not to measure torque.