A torque multiplier is specially designed to increases the torque that can be applied by an operator. Because the power output cannot exceed the power input, the number of output revolutions will be lower than the number of input revolutions (Torque x rpm = Power) Torque multipliers incorporate an 'epicyclic' or 'planetary' gear train includes of one or more stages. Each stage of gearing increases the torque applied by a factor of 5.

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