What tool is utilized to measure the specific tightness of a fastener?

The tool designed to measure the specific tightness of a fastener is a torque wrench. This instrument allows the user to apply a precise amount of torque to a nut or bolt, ensuring that it is tightened to the manufacturer's specifications. Torque wrenches are critical in applications where correct tension is essential for performance, such as in automotive assembly, machinery, and construction, to prevent loosening or overtightening that may lead to failure or damage.

The other tools mentioned have different primary functions. A socket wrench is generally used for turning fasteners but does not measure torque. An adjustable wrench can grip various sizes of nuts and bolts, but it also lacks a measurement feature for tightness. Pliers are versatile tools for gripping and bending but are not intended for applying or measuring torque to fasteners.