Not all ball-screw makers spec products the same way. Stiffness or rigidity is a key factor in evaluating ball-screw drives for specific needs. Rigidity, in this context, describes a ball screw's ...

A screw with a five-sided head that is used in Apple products as well as others. The pentalobe design was chosen to make the case more tamper-proof; however, small pentalobe screwdrivers became ...