Torque sensor for calibrating screwing tools

A torque sensor for calibrating screwing tools, comprising an inner body defining an axis with respect to which a torque is to be measured and having seat means for engagement of a screwing tool to be calibrated, and an outer annular body held stationary, said outer annular body being coaxial with said inner body and being connected with said inner body through radial webs of a first type and through radial webs of a second type, said first type webs having relatively large width circumferentially but having relatively small axial dimensions, and forming a first cross of four first type webs angularly spaced by 90° about said axis, and said second type webs being relatively narrow circumferentially but having relatively large axial dimensions and forming a second cross of four second type webs angularly spaced by 90° about said axis, said second cross being angularly offset relative to said first cross by 45°, and further comprising torsion measuring means attached to said first type webs for measuring torsional deformation due to torques exerted on said inner body, said torsion measuring means comprising measuring elements on all four first type webs, said measuring elements being interconnected to provide a measured value indicative of the torque exerted on said inner body about said axis while substantially compensating for disturbing forces.