Which range is considered safe for the operation of a torque wrench?

The safe operating range for a torque wrench is often established to ensure both the accuracy of the tool and the integrity of the fasteners being tightened. In this case, the range of 25%-75% is ideal for effectively using a torque wrench. This range allows the tool to consistently provide reliable torque output while minimizing the risk of over-torquing or damaging the fasteners, which can occur if the wrench is used too close to its upper limit.

Using a torque wrench within this specified range helps in producing the required tension without exceeding the limits that could compromise the wrench's calibration or the integrity of the application. Operating outside of this range, either too low or too high, could lead to inaccurate torque readings, which is critical when working in mechanical and industrial applications where precision is essential for safety and performance.

Other ranges may seem possible, but they might not provide the optimal balance between usability and safety, potentially leading to either under-torquing or over-torquing issues. Hence, the 25%-75% range is widely recognized as a standard for safe and effective torque wrench operation.