What does a torque wrench measure?

A torque wrench is specifically designed to measure the torque applied to a fastener. Torque is the measure of rotational force, and in the context of fasteners such as bolts and nuts, it is essential to apply the correct amount of torque to ensure proper clamping force and avoid problems like loosening or damage.

When using a torque wrench, the user sets a desired torque value based on specifications for a particular application, and the wrench indicates whether this value has been reached, either through a clicking mechanism, a digital display, or a torque dial. This precision in measuring torque is crucial in many engineering and mechanical applications to maintain reliability and safety.

The other options do not align with the function of a torque wrench. For instance, while measuring the angle of rotation or the tensile strength of materials may be relevant in various mechanical contexts, they are not the focus of torque wrenches. Similarly, while friction is an important factor in mechanics, it is not what a torque wrench is designed to quantify.