Which tool is primarily used for tightening or loosening nuts and bolts?

The primary tool used for tightening or loosening nuts and bolts is a torque wrench. This tool is specifically designed to apply a precise amount of torque when fastening or loosening bolts and nuts, ensuring that they are neither too loose nor too tight. Using the correct amount of torque is critical in many applications, particularly in assemblies where the integrity of the joint is essential for safety and performance.

A torque wrench allows the operator to measure the torque being applied, which is important for meeting manufacturer specifications and ensuring that the joint can withstand operational loads without failing. This feature sets it apart from other tools used in similar contexts, as a torque wrench provides both measurement and control.

In contrast, the pipe wrench is primarily used for gripping and turning pipes rather than nuts and bolts, while a screwdriver is suited for driving screws. A hacksaw, although essential for cutting pipes and other materials, does not play a role in tightening or loosening bolts and nuts. Therefore, the torque wrench is the appropriate tool for the task at hand.