Impact wrench

An impact wrench is a socket wrench power tool designed to deliver high torque output with minimal exertion by the user, by storing energy in a rotating mass, then delivering it suddenly to the output shaft. In operation, a rotating mass is accelerated by the motor, storing energy, then suddenly connected to the output shaft, creating a high-torque impact.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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