Pneumatic torque wrench is a torque wrench that uses a high-pressure air pump as the power source. It is a torque multiplier with three or more layers of turnover gears driven by one or two powerful pneumatic motors. By adjusting the gas pressure to control the torque size, each tool is equipped with a dedicated air pressure comparison chart and calibration report to allow specific torque requirements to be set. For further application, pneumatic torque wrenches can be combined with torque sensors to achieve more accurate output torque. After obtaining the required torque, a suitable circuit system can be used to manually or automatically shut off the air source.

Air impact wrenches are widely used in many industries, such as automotive repair, heavy equipment maintenance, product assembly (usually referred to as "pulse tools" and specifically designed for precise torque output), major construction projects, installation of steel wire inserts, and high torque output needs anywhere else.