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Screws
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this post was submitted on 07 Oct 2025
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What is labelled "flat" here I've only ever heard of as "countersunk" and what's labelled as "slotted" I've only ever heard of as "flat head". Also wtf is "PF"?
"square" aka Robertson
I thought, for some reason, that Robertson was ostracized from the screw world.
Best drive going hands down. I don't need a deliberate tourqe out to save my driver, I'm a big boy. Plus it usually just breaks the screw
Yeah screw Robertson
In the USA maybe.
Everywhere else it's pretty common.
Fun fact, Henry Ford wanted to use them on his cars, but tried to screw Robertson in the deal. His petulance is the reason that Americans can't benefit from this perfect design.
I knew there was some reason for it, but I couldn't get my brain to remember what it was; but this sounds familiar.
PF = Plastic thread Forming. They are basically a self-tapping screw meant for plastics.
ah ok neat. Thanks!
I had the same thought! Also I’ve only ever heard “torx” instead of “six lobe” although I’m guessing torx is a brand name.
The one labelled phillips i only ever heard it being calles "cross" and the one labelled pozidriv i only heard it being called "star" but maybe is just my country
A "cross head" generally refers to the JIS, (Japanese Industrial Standard), version of the philips screw. Because evidently they were too lazy to design something original. They require their own special set of screwdrivers to fit correctly, (the philips drivers are close, but no cigar).
Yeah, in the US I've only heard "Philips" or occasionally "four way". We say star here also though, but I think for the "six love" iirc
damn your area uses dumb names for things then lol
calling a drive type by the head shape, that's wild
Thanks -- little known fact, I time traveled to a hundred years ago to invent these terms.
neat