Threaded fasteners have been around and used to assemble a variety of products for so long that it is often assumed that everything is known about them. This confident assumption often leads operators to tighten a given fastener until it “feels” tight and they are done with it. In some applications this approach may prove satisfactory, but with critical applications, which can impact a financial bottom line through costly rework or warranty repairs, the old “feels tight, must be right” method is inadequate.