What does this "socket" fit ?

[mklotz]

I bought this set of 6 mm bits because, in addition to all the odd forms, it contained a complete set of miniature sockets, 2.5 - 5.0 mm by 0.5 mm steps.



I noticed that there was an extra "socket". Not a conventional hex, it looked like a female die for making the tip of a Philips head screwdriver



and, indeed, perfectly fit a #2 Philips bit.



What sort of fastener is this bit meant to fit or does it have some other purpose?

[Arcane]

I have both internal and external Torx drivers/sockets so maybe it's like those, made to mate up with an external #2 Phillips headed bolt/screw?

[Ringo]

looks like a #2 phillips driver for a hex head screw.
Will that allow a #2 phillips to drive 1/4" hex bits?

[CCWKen]

Security fasteners change all the time. Maybe that's a new one. I sure don't know why you'd want to drive a 1/4" hex with a Phillips. ???

[BCRider]

I'm sort of thinking that it's some new seldom seen sort of security fastener too. Otherwise it's just WAY too Rube Goldberg'ish…..

[PStechPaul]

What is the shape on the left side?

Oh, now I see that it is just a 1/4" hex. It looked like the brown facet was a tapered slot.

Here is the answer: https://diy.stackexchange.com/questi...crewdriver-bit

[mklotz]

Thanks for the information, Paul.

The shape on the left is the 4 mm hex that all the bits have; it is these hex ends that fit into the magnetic sockets on all the handles.

Your URL shows exactly the same tool kit that I have. Apparently the individual who submitted the question had the same confusion about this bit that I had.

The screw head you show (convex Phillips ?) is has exactly the shape that this socket would fit. The shape would certainly serve as a security feature.

I've never seen screws of this type; have you?

[J Tiers]

I certainly never have. I would assume they are always used in a recess, since the pointy Phillips part would be a nasty item to have poking out of some surface. Also it would be subject to damage rendering it not possible to remove.

[lynnl]

The big question is Why? What purpose or application is that serving, that could not be served as well or better by some far more orthodox fastener? The classic solution in search of a problem.

Having the engagement features raised like that would seem to make them more susceptible to damage.

[old mart]

There are so many variations, it blows your mind.

https://www.instructables.com/id/Whe...ot-a-Phillips/

[Georgineer]

Of course, if you filed the lump off after installing one of these screws, it would make a very effective security screw...

George B.

[CCWKen]

I think it was Chevy that had security spark plugs some years back. They just broke-off when you tried to remove them.

[MattiJ]

I think it was Chevy that had security spark plugs some years back. They just broke-off when you tried to remove them.

Torque to yield fasteners are common in automobiles so torque to shear is the next logical step. Shear-head bolts and nuts are actually quite common in some products like powerline extensions/couplers.

[nickel-city-fab]

I think it was Chevy that had security spark plugs some years back. They just broke-off when you tried to remove them.

Ford Triton engines have a special kit just for busted off plugs, they are infamous for it. Chevy was the busted off manifold bolts. You remember when they had special wrenches with 3 different bends in them?

[CCWKen]

Oh yeah, I remember now. Thanks for helping me relive a nightmare.