What is the working principle of a torque wrench?

[DylanAnn]

Torque wrench working principle: The torque wrench is designed based on the bending principle of beams, the torsion principle of torsion bars, and the compression principle of helical springs, capable of measuring the torque applied to a nut. Torque wrenches can be categorized into: preset torque wrenches, digital torque wrenches, MINI torque wrenches, fixed-value torque wrenches, dial torque wrenches, sector torque wrenches, and special torque wrenches. The torque wrench first sets an upper limit for the required torque value. When the applied torque reaches the set value, the wrench will emit a clicking sound or bend slightly at the connection point, indicating that the fastener is tight and no additional force should be applied.