Power tool

A power tool comprising:

• a motor;
• a gear;
• a shaft for delivering a torque, the shaft being drivingly connected to the motor via the gear;
• and
• a housing that at least partly houses the motor, the gear, and the shaft,
• wherein the shaft comprises a longitudinal cavity in which a torque transducer is arranged to measure a torque acting over a portion of the shaft,
• wherein the longitudinal cavity comprises:
• a first contact surface for torque transferring contact with a first end portion of the torque transducer;
• and
• a second contact surface, separated from the first contact surface, for torque transferring contact with a second end portion of the torque transducer,
• wherein the portion over which the torque is measured is located between the first and second contact surfaces, and
• wherein the torque transducer is arranged inside an interior of the longitudinal cavity of the shaft, and comprises:
• at least one torque measuring element;
• the first end portion, which is in torque transferring contact with the first contact surface in the interior of the longitudinal cavity of the shaft;
• the second end portion, which is in torque transferring contact with the second contact surface in the interior of the longitudinal cavity of the shaft;
• a torsionally resilient portion provided between the first and second end portions and over which the torque is measured by the at least one torque measuring element;
• and
• a circuit board arranged inside a hollow portion of the torque transducer.