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the type of this screw

force1711

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hello everyone.

i have a chair with this screw.

i want t open it, buy don't know what is the type of this screw.

i added here the picture.

can, somebody, kindly let me know what is the type of this screw?

many thanks in advance.
 

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force1711

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many thanks for the quick reply and want to help.
but, its not show, head torx, like the picture that i added.
many you have another idea, which type of screw this in the photo that i added?
its not like any screw that i know, and it's a long time that i searching the match screw.
 

dnschmidt

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It's what's known in the woodworking world as a combination screw. It's really a Robertson #2 with the ability to be driven or removed by a Phillips in a pinch. They actually make special combination bits that combine Robertson and Phillips features for driving these screws. It's more of a Robertson than a Phillips so start with a Robertson #2 as it will fit better.
 
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force1711

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many thanks for your replies.
as i know the Roberton is simply square.
but this one, is a square with a 4 "slots" in the sides.
i found this one:

its like this.

which screwdriver will be perfect to open theses screws?

i don't found the matched screwdriver for this.

sorry for my poor english.
.
 

BrandonV

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many thanks for your replies.
as i know the Roberton is simply square.
but this one, is a square with a 4 "slots" in the sides.
i found this one:

its like this.

which screwdriver will be perfect to open theses screws?

i don't found the matched screwdriver for this.

sorry for my poor english.
.

You can use either a #2 Philips OR a #2 Robertson on that screw.

If you want a combination bit look at Quadrex or Recex.
 
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force1711

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You can use either a #2 Philips OR a #2 Robertson on that screw.

If you want a combination bit look at Quadrex or Recex.
many thanks. its really Quadrex. but, i don't' find this screwdriver. only bits.
maybe you know, if there is also a screwdriver with this socket, Quadrex?

thanks again.
 
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BrandonV

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many thanks. its really Quadrex. but, i don't' find this screwdriver. only bits.
maybe you know, if there is also a screwdriver with this socket, Quadrex?

thanks again.

I've never seen a screwdriver with a Quadrex or similar tip.

I would just use a 1/4" bit holding screwdriver with the bit.
 
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force1711

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the bit Quadrex, are coming with a few sizes, like Roberton, Philips and more, or only with one size?
i mean, this Quadrex, came also with a few sizes, or only one size?

many thanks.
 

BrandonV

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the bit Quadrex, are coming with a few sizes, like Roberton, Philips and more, or only with one size?
i mean, this Quadrex, came also with a few sizes, or only one size?

many thanks.

I've seen them in #1, #2, and #3 with #2 obviously being the most popular.
 

dnschmidt

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If you want a combination bit look at Quadrex or Recex.
That's the proper names for the driver bits. They were lurking in the back of my brain I just couldn't think of them when I wrote my reply. I think both Lee Valley and McFeeley's sell these bits.
 

KnurledNut

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As many here have, I've removed/installed hundreds, probably thousands, of those.
Dont overthink it.
Either a square or crosshead driver will work just fine.
Combo head screws have become the norm in a lot of manufacturing.
I have Quadrex bits and in real world use, the advantage is hardly noticeable. They are usually not great quality and wear fast.
Get a high quality □ or + driver set if you dont have one. Either will be far more useful than a dedicated subpar bit.
 
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force1711

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As many here have, I've removed/installed hundreds, probably thousands, of those.
Dont overthink it.
Either a square or crosshead driver will work just fine.
Combo head screws have become the norm in a lot of manufacturing.
I have Quadrex bits and in real world use, the advantage is hardly noticeable. They are usually not great quality and wear fast.
Get a high quality □ or + driver set if you dont have one. Either will be far more useful than a dedicated subpar bit.
thank you very much for the help.
i have the square Roberton bits.
are you can recommended for a high quality screwdriver with a Robertson slot?
Milwaukee, Stanley, or wera? or maybe you can recommended of another brand?

thanks a lot!
 

dnschmidt

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thank you very much for the help.
i have the square Roberton bits.
are you can recommended for a high quality screwdriver with a Robertson slot?
Milwaukee, Stanley, or wera? or maybe you can recommended of another brand?
Obviously, ROBERTSON. These can be obtained from McFeeley's. The true Robertson screwdrivers, like their bits, are two piece affairs with a hardened tip inserted into a steel plated shaft. Here is a link:

 
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force1711

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and what is the different between the Quadrex vs the recex?
 
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