Don't listen to old @
humfrz. He learned wrenching from his drinkin' buddy, Bubba. Now, ol' Bubba liked to think his hands were calibrated but every time he tightened down a fastener, he tightened just a little bit too much. That's why his nuts and screws always seemed to strip out after the fifth or sixth time he tightened them.
Use a torque wrench.