Which of the following best describes the action of a torque wrench?

• A. It applies controlled torque to fasteners.
• B. It measures the thickness of materials.
• C. It marks starting holes.
• D. It indicates cylinder pressure.

Answer: (A)

A torque wrench is used to apply a precise amount of torque to fasteners. This ensures the fastener is tightened enough to hold components together without risking damage from overtightening or loosening over time. The tool works by allowing you to set a specific torque value; once you reach that value, the mechanism signals you with a click, a beam deflection, or a digital readout, indicating you’ve reached the target. This controlled tightening is essential for reliability and safety in assemblies where exact clamping force matters.

The other options describe different functions: measuring thickness is done with a thickness gauge or caliper, marking starting holes is done with a center punch or marker, and indicating cylinder pressure is the job of a pressure gauge. Thus, the action of applying controlled torque to fasteners best fits the purpose of a torque wrench.