The other day I was helping a friend’s son do a brake job on her van. After we were done with the brakes we were putting the wheels back on and I was explaining to him how to make sure that we did not over tighten the lug nuts.
After checking the owner’s manual to see what the correct torque should be, I showed him how to use the torque wrench. By presetting the calibration, the torque wrench will get to the desired tightness and the clutch will slip, signaling that it is time to stop tightening. This keeps you from over tightening the lug nut, but also insures that it is tight enough.
There are several types of torque wrenches but this is my preferred version.