What should torque wrenches be set to when not in use?

When a torque wrench is not in use, it is best practice to set it to the lowest settings. This is to relieve the internal tension on the mechanism of the wrench, which helps preserve its accuracy and extends its lifespan. Torque wrenches, particularly click-type wrenches, are calibrated to exert a specific amount of torque, and if left at higher settings, the internal components can become stressed over time. This can lead to inaccuracies when the wrench is next used.

By adjusting the wrench to the lowest setting, you minimize strain on the wrench's internal spring, thereby maintaining its calibration and ensuring it delivers accurate torque readings during its next use. This practice is essential for maintaining tools in optimal condition and ensuring safety and precision in any application involving torque measurement.