How can the torque of a roof bolt be accurately determined?

The torque of a roof bolt can be accurately determined by using a torque wrench. This tool is specifically designed to apply a precise amount of torque to nuts and bolts, ensuring that they are tightened to the manufacturer's specifications. A torque wrench measures the amount of force being applied and allows the user to set a specific torque value, which is crucial in mining operations to ensure that roof bolts are properly secured for safety and structural stability.

Using a measuring tape does not provide any information about the torque applied to a bolt; it only measures lengths. Applying a consistent force manually might be somewhat effective, but it lacks the precision that a torque wrench provides. Visual inspection of the tightening process might give an indication of whether the bolt appears tight, but it cannot quantify the exact torque applied or ensure that it meets safety standards. Therefore, a torque wrench is the only method that reliably measures torque accurately for bolting applications in mining operations.