Abstract: A nut runner for applying torque to a workpiece such as nut, bolt or the like positioned at a right-angle to the fastening device. The nut runner includes a motor, a speed reduction gear assembly, a right-angle bevel gear system, a planetary gear system, an in-line torque transducer disposed between the bevel gear system and the planetary gear system, a torque reading transmitter, and a workpiece engaging member. The bevel gear system, planetary gear system and torque transducer form a concentrated assembly which provides for a compact nut runner to access confined assembly areas. The motor causes the engaging member to rotate. The torque transducer senses the torque and the torque reading transmitter sends the reading to an operator or controller which interrupts the power supply to the nut runner when a predetermined torque is reached.