When selecting torque wrenches, what is the recommended final torque range?

The recommended final torque range of 20%-90% is based on ensuring consistent, accurate, and safe application of torque during fastening operations. This range allows for sufficient calibration margin to account for variations in the tool's accuracy and the specific material properties of the components being fastened. By utilizing a final torque within this range, it ensures that the fasteners are adequately tightened to prevent failure under stress, while also avoiding the risks of over-torquing that could lead to material deformation or failure.

Applying torque levels below 20% may not sufficiently secure the joint, while applying above 90% may exceed the mechanical limits of either the fastener or the materials being joined, potentially causing damage or compromising integrity. This balance within the 20%-90% range fosters reliability in the assembly process, which is crucial in quality assurance practices.