When using a micrometer torque wrench, what indicates that torque has been reached?

A micrometer torque wrench is designed to provide a precise measurement of torque applied to a fastener. When the correct amount of torque has been reached, the wrench is engineered to produce a distinct sound, such as a click. This audible indication is critical because it serves as an immediate signal to the user that they should stop applying additional force.

Using an audible signal helps prevent overtightening, which can lead to damage to the fastener or the material being worked on. Understanding this feature is vital for anyone using a torque wrench, as it promotes proper torque application in mechanical assemblies, enhancing the reliability and safety of the components involved.

Other methods of indicating torque, such as a display or illumination, are not typically features of traditional micrometer torque wrenches, which rely on mechanical signaling rather than electronic. The option related to the handle not turning is misleading; while the handle should remain firm once the specified torque is achieved, it does not serve as an effective indication on its own like the audible click feature does. Thus, the clicking sound is the most recognized and reliable indicator of achieving the desired torque level.