Which tool is used to apply a precise torque to fasteners?

Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Controlling the clamping force on fasteners requires applying a precise amount of torque, not just guessing by feel. The tool designed for that purpose is the torque wrench. You set the required torque on the tool, then apply force until the wrench signals that the target has been reached—typically a click, a peak on a beam, or a digital reading. This ensures the fastener is tightened to the exact specification, which helps prevent both over-tightening (which can strip threads or damage parts) and under-tightening (which can allow joints to loosen). Different types exist, including mechanical click-type, beam, and digital, so you can choose based on the range and the precision you need. Remember that lubrication, thread condition, and surface finish affect the actual torque you apply, so always follow the specified torque value and any lubrication notes, and recalibrate the tool as required. Other gauges measure dimensions or gaps (like thickness, runout, or clearance) but do not apply or indicate torque, so they’re not used to tighten fasteners.