"Screws fall out all the time. The world is an imperfect place." The Breakfast Club (1985) Should you use a nail or should you use a screw? It's a question as old as time itself. Or, at least as old as woodworking. Or, at least as old as nails and screws. In order to answer this elusive question, we need to understand each ones' strengths. Grip Strength Vs. Shear Strength Screws apply what is called grip strength to the two pieces you are screwing together. Grip strength is how well the fastener can draw the wood together. The threaded design of a screw causes compression…