However, too much torque and the screwdriver will slip. Locating the screwdriver in the screw is easier, and more torque (twisting force) can be applied. Phillips-head screws have a deeper, more positively engaging slot. The Phillips-head screwdriver was invented to overcome the issues with slotted screws.
Unfortunately, it’s easy to twist the screwdriver out of the slot (cam out), damaging the head and making screw removal difficult. Some people – cabinetmakers, in particular – prefer the appearance of a slotted screw, especially a row of them with the slots lined up.
Slotted screws are cheap and so remain popular. The slotted screwdriver has been around for a few hundred years. While there are many types of screwdrivers available, there are just three in common use: slotted (flat), Phillips, and Torx (star). Even though more than 700 of his screws were used on each Ford Model T, the format never really caught on. That honor belongs to a square-headed version invented by P. The Phillips-head screw was invented in the 1930s by Henry Phillips, but it wasn’t the first variation on the slotted screwhead.
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