A torque wrench is a specialized tool used to apply a specific amount of torque to a fastener, such as a bolt or nut. This ensures that the fastener is tightened to the correct specification, which is crucial for the safety and performance of mechanical assemblies. Torque wrenches come in various types, including click-type, beam-type, and digital models, each designed for different applications. Using a torque wrench helps prevent over-tightening, which can damage components, or under-tightening, which can lead to mechanical failure. Proper use of a torque wrench is essential in fields like automotive repair, construction, and machinery maintenance, where precise fastening is critical for reliability.