What is the purpose of a torque wrench?

A torque wrench is specifically designed to measure the amount of torque applied to a screw or bolt fastener. It ensures that the fastener is tightened to a precise level, which is critical for maintaining the integrity and performance of mechanical assemblies. Over-tightening can lead to material failure, while under-tightening can result in joint looseness, leading to potential operational hazards or mechanical failure.

In contrast to some of the other options, measuring screw length, cutting threads, or fastening pipes involves different tools and techniques. For example, measuring screw length requires calipers or a ruler, while cutting threads involves taps or dies. Fastening pipes securely typically utilizes wrenches or other pipe-specific tools, rather than a torque wrench that is focused on the precise application of force.