Hex wrenches, also known as Allen keys, are the tools you use to screw and unscrew fasteners that have a hexagonal recess (as opposed to a Phillips or flathead recess). Hex screws are commonly used on ...

Decades ago, every electronic device was sealed with one of two types of screws: a minus-shaped Flat/Slot head, or a plus-shaped Phillips head. There was no concept — at least, for common consumer ...

From slotted screws in the 1800s to today’s security fasteners, screw design is a story of constant frustration and innovation. Phillips heads were created to slip deliberately, protecting workers ...