Which tool is commonly used to tighten or loosen bolts and nuts?

The tool commonly used to tighten or loosen bolts and nuts is a wrench. Wrenches are specifically designed to grip and turn fasteners like nuts and bolts, providing the necessary leverage to adjust their tightness. They come in various types and sizes, such as open-end, box-end, adjustable, and socket wrenches, each suited for different kinds of fasteners and tasks.

Using a wrench allows for a secure grip and the application of sufficient torque, which is essential when working with fasteners that require precise turning to secure components or to disassemble machinery. This is particularly important in maintenance work where proper assembly and disassembly are vital for safety and functionality.

In contrast, hammers are generally used for driving nails or breaking objects, while screwdrivers are specifically designed for turning screws, which have a different shape and mechanism from nuts and bolts. Pliers can grip and twist but are not as effective for applying the torque needed for bolted connections, particularly in tight spaces or with larger hardware. Therefore, the specialized function of wrenches makes them the correct tool for the task of handling bolts and nuts.