Screws

Wait, cheese? I'll take twenty

Calling it a square not a Robinson makes me doubt everything else on this including the ones I know are right.

Same with 6 lobe instead of torx
- Torx is a trademarked name, 6 lobe is generic Torx.
  Like how everybody calls a tissue a Kleenex.
- Or 6 lobe tamper: security torx. Or hexagon: Allan key. Seriously.
- Weird, I've only ever heard torx and square.

I'd like to go on record as saying six-lobe tamper can die in a fire.

Use a hammer and punch to break off the pin.

Screw drive arguments are my absolute favorite, thank you OP for posting such divisive content!

A square screw is a Robinson, fyi.

Robertson
Also the 6 lobe or whatever it's called in the diagram is usually called a torx.
Robinson ftw though.
- Robertson
There's some anti-Canadian bias in this chart for sure.
Don't call Philips after the inventor but Robertson after the shape.
"No! The RED-handled Robbie screwdriver! And hold the light steady" is like half my experiences with my dad. :-D Such a red-foreman.

The first two are screw heads. The rest are mental illnesses.

Phillips slot is very hand tbf, you have a phillips screwdriver? Good you will have good grip, you don't have one? Good you will still be able to unscrew that
- I get a better grip with slot than Phillips, which is good if I'm using an electric screwdriver and want to cam out at a certain torque
- I'll give you that but all the others are in my opinion completely unnecessary and just cause issues. To me anything other than a Philips head is completely unnecessary and deliberately over complicated.

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"?

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
- 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 lobe" iirc
"square" aka Robertson
- I thought, for some reason, that Robertson was ostracized from the screw world.
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.

Wonder what the usecase for "H-type" would be

trolling someone
As written by others: Anti-tamper and proof of tamper. Not only can you make it harder to open the case, but you can also intentionally use bits for manufacturing that are non-standard(e.g. leave a little bit of the inner or outer part out) and when you get a device back that has a fully used screw you can tell the customer to fuck right off with their claim.
Especially for medical devices that is sometimes done - and tbf,understandable as there are devices that really really shouldn't be opened by anyone who is not manufacturer associated.
For vocalists, if the only tool they have is a tuning fork.
Anti-tamper.
I've seen them used to screw together toilet stalls in public bathrooms. Stops bored crackheads disassembling them.
Anti tamper and devices not intended to be opened. Ive seen them on european power bricks and blocks
usecase
use-case, right?

What is this square?

It is called a Robertson not a square.

Technically Robertson has a taper to it, while square drive doesn't. Though nobody really differentiates it in common usage.
At least with star drive, while they are the same, pretty much everyone calls them Torx.
It's called Robertson by proud Canadians, in the US, at least, "square" is common. A square drive also wasn't invented by Robertson, he just made the tooling for manufacturing the screws to be economical.
- If you're looking at a guide like this, it's pretty likely that it's because you need to know what to put into a search engine to buy the right screwdriver, so it's absolutely got value to know the name other people are using for a thing and selling it as.
- The perimeter of the hole is square. The hole and driver are a trapezoidal prism.

Phillips/square? You mean pre-half-stripped and here I come with a too small screwdriver to finish the job.

Philips/Square/Slotted (all three combined) is really common in North American electrical. Switches, outlets, breakers; all commonly use them for terminal screws.
Great for lower torque applications; you certainly wouldn't use them for like a deck/structural screw.
- You can torque a Roberson until either the screw, driver, or motor break
i don't always strip my screws to death but when i do, what the hell do you mean they got the job started for me?

I'm looking for a Six-Lobe Tamper Cheese screw.

Torx for the win.

also relevant Bonus xkcd

Torx torx torx torx!
I use exclusively torx or tamper-proof torx for my projects and I love it so much.
I worked as a supervisor where my predecessor thought square/Robertson were superior without listening to the others who were used to torx. I very quickly changed back to using torx.
- Would you have let an employee continue to use Roberson if that was their preference?
- Whats the advantage of 1 over the other?
Hexagons are the bestagons!

And if you lack the screwdriver. So long as the head is not the flat style and you have room. Angle grinder/dremel and everything turns into a slot head screw.

Slot screw head you mean. Flat head refers to a head with a shape designed to go into a countersunk hole.
- ....no it doesn't. Flat head screwdriver. The head type is called a countersink or self-setting.
- Translation error

Never heard of Phillips the screw before. We call it Kreuzschlitzschraube and the tool for it is a Kreuzschlitzschraubendreher, and I think that's beautiful.

But it's absolutely fascinating that torx on the other hand is here with its generic name.
Although in my opinion there are three slots only: torx, hex and wrong.
And who renamed the inbus? This is not a maths class!
- Not pictured here is also 'JIS' or Japanese Industry Standard screws.
  They are very similar to Philips, but they're slightly deeper with sharper corners. They have less tendency to 'cam-out' and strip the screw head.
  Supposedly the camming out thing is actually intentional design in Philips screws, to prevent screw guns from over torquing screws in early automotive/aircraft assembly lines; but there's not actually evidence to support that according to Wikipedia.

Anyone know what the heck the Pozidriv/Round Hole combo is for?

Don't quote me, but if I remember correctly, that is the larger size where the center is more solid like an elliptical half oval that extends nearly to the tip and the fins of the cross are attached. I think it also has the four Pozi minor points at 45 degrees from the cross. It has more of a spline like structure rather than the four pointed cone of a typical Phillips. That tip won't fit any other Phillips cross. I have only used them a few times, but have had many driver sets that include them. These type are usually tossed in my misc tools drawers because accidentally grabbing them is annoying..
psychopaths
Anti-removal/tamper resistant. The angle of the slots make it really easy to tighten, a fucking bitch to remove.

Tag yourself I'm cheese square

If you're talking about the piefed tags, we need an auto tagger of some sort. I do not use tags for anything outside of AI fine tuning and training. I do not know the scope of use, and creating a bunch of single occurrence tags is beyond useless like what archive dot org has devolved into. We must have a system like gelbooru/danbooru for tags selection and moderation if that is to be sustainable or useful over time... or I simply do not understand the use scope.

Anything in the bottom two rows (other than hex) and you are welcome to curse the ancestry of the person who decided to use that type of fastener.

SQUARE

You mean Robby

Canadian detected.

Now I want to see a 'how it's made'.

Okay, now I'm really confused. I was going to comment that the six-lobe shape is known to me as star bits, and then I did a search to see if anyone else uses the name, but these sites say they're 5-point bits, but they're star-shaped, not pentagons. The star bits in my security bit set all have six points, and I've not come across a five-pointed star screw because I'd surely remember being pissed off about them not working. Where/when are five-pointed stars used?

6-lobe, star, and Torx are all names for the same somewhat common screw type. Torx is a trademarked brand name however.
Separately there's a 5-lobe screw called 'pentalobe' that's looks just like the 6-lobe but with, well..., 5 lobes. It was developed by Apple iirc, to keep people out of their products and make repair harder.
- My previous house had security screens on the windows with screws that I could never find a driver for - it was a few years ago, but I think they were pentalobe with the security nub in the middle. I didn't look too hard though - it was a good excuse to not wash the windows.
The common hack makes it easier to remember: the common star, or brand name Torx, is the same as a hexagon. If you have a full set of both SAE and Metric star drivers, there is a star that will fit tightly into nearly all hexagon cap screws. If you strip a hexagon screw cap, using a star driver will often work to remove it. This only works because it is the same number of points.
There are many other types, but the common star is the 6 point.

Now what I want is a chart of use cases with them all listed in order by usability for each use case.

A good portion of these are 'security'/anti-tamper fasteners, which basically just means they're intentionally weirdly shapped and uncommon so people aren't likely to be carrying the screwdrivers to tamper with stuff.
Stops things like bored crackheads disassembling the toilet stall in a public bathroom.

Give me a bunch of flat phillips/slot and I'll assemble the world

Nice drawing, but how exactly is this a guide?

I would actually love to see explanation of what is best use case for the screws (the first two rows)

You only need Torx screws (six-lobe) The only reason to have a bit set with the rest of the heads is so that you can remove an old fastener and replace it with torx.
Try designing stuff to share with people in CAD. You'll quickly learn to collect such references.

Philips are too easy to strip and Slotted screws are rage inducing trying to keep the driver aligned. :(
- Philips are too easy to strip
  Sluts
Disagree, Torx all day.
- Everything should be a bolt head, you strip bolt heads from incorrect spanners or when shits fucked.
  Everything else just fails.
  Today I had a 10mm Allen key head strip internally because it was just to damn tight from rust.