this post was submitted on 28 Jun 2023
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Torx is the only head that needs to exist. The rest can go fuck a rusty chainsaw.
Square is really good too.
Phillips and flat head bits fit in a variety of sizes of screw heads. We seem to have chosen convenience over performance.
If memory serves me correctly square drive is patented, & thus requires licensing, which is why it's less commonly used.
Who the hell let someone patent a fucking SQUARE
Square is good for small screws. Under torque the head will tend to break or strip. That said, a torx head does everything a square head does, but better.
Slotted heads, Philips, posidrive, torx, 6 pan and Robertson.
Each has a use, for instance a slotted head, when you don't need much torque is good enough (like for a screwed in battery compartment).