What is a torque wrench used for?

A TORQUE WRENCH is used to tighten a fastener (bolt or nut) to a SPECIFIC, PRECISE amount of torque (tightening force), as specified by the manufacturer. ASVAB Shop Information tests tools. Proper torque is critical — too loose and the fastener may come undone; too tight and it may strip, break, or damage parts (especially important for engine components, wheel lug nuts, etc.). The torque wrench 'clicks' or indicates when the set torque is reached. Knowing the torque wrench's purpose (applying precise tightening force) is commonly tested.