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#1
Old 05-27-2015, 07:11 PM
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What's the name for a 2mm square hole in a screw head?

This stove has a stainless top held on by 2 screws with square holes, about 2mm across. I can't find the right term to buy a driver for this head. Why the stove company chose this, I have no idea.
#2
Old 05-27-2015, 07:14 PM
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Square drive.

Last edited by beowulff; 05-27-2015 at 07:14 PM.
#3
Old 05-27-2015, 07:16 PM
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Also google "Robertson screws" ...
#4
Old 05-27-2015, 07:18 PM
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As I understand it, Robertson screw heads are more of a Canadian thing... probably because they are a sensible design.
#5
Old 05-27-2015, 07:27 PM
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I like that Home Depot link, but putting square drive 2mm into Ebay is getting me nowhere. Is there something else I should put in, do you think?
#6
Old 05-27-2015, 07:28 PM
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They are/were big in the RV field too. Very good for use with power drivers.
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#7
Old 05-27-2015, 07:30 PM
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Quote:
Originally Posted by Cardinal View Post
I like that Home Depot link, but putting square drive 2mm into Ebay is getting me nowhere. Is there something else I should put in, do you think?
It's probably not 2mm.
Just put in "square drive bit."
#8
Old 05-27-2015, 07:31 PM
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Square drive is getting me things everywhere that have the back end with a square hole, not the driver tip.
#9
Old 05-27-2015, 07:32 PM
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Try "square bit" in eBay. I got 4,675 listings.
#10
Old 05-27-2015, 07:46 PM
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Quote:
Originally Posted by md2000 View Post
As I understand it, Robertson screw heads are more of a Canadian thing... probably because they are a sensible design.
to be fair, Philips was a sensible design back when it was invented. It's supposed to cam out of the screw head before enough torque can be applied to break the screw or ruin the threads.

nowadays a Robertson/square drive makes more sense since most powered screw drivers have some sort of torque limit setting. but inertia keeps Philips going.
#11
Old 05-27-2015, 07:52 PM
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I knew Robertson was a Canadian thing, but I thought EVERYONE knew the name by now.

Best screw head ever. You can torque the shit out of it without stripping it.
#12
Old 05-27-2015, 08:06 PM
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Robertson seems to be the clue I needed. Even my engineer dad, who owns almost every tool for the house, didn't think of that name. The Wikipedia page on screw heads notes that Robertson had big legal problems with his patents outside of Canada, and the design didn't make much headway in foreign markets.

Is there a definitive list of what #2, etc means? The Robertson link here: http://en.wikipedia.org/wiki/List_of...ives#Robertson seems to try, but skips over a 2mm hole in the screw head.

Last edited by Cardinal; 05-27-2015 at 08:10 PM.
#13
Old 05-27-2015, 08:16 PM
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Square drive screws are pretty common.
I prefer then for big drywall screws, because they drive way better than Phillips.
Most woodworker's stores (e.g. - Rockler) have a large selection.
#14
Old 05-27-2015, 08:26 PM
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Quote:
Originally Posted by Cardinal View Post
Robertson seems to be the clue I needed. Even my engineer dad, who owns almost every tool for the house, didn't think of that name. The Wikipedia page on screw heads notes that Robertson had big legal problems with his patents outside of Canada, and the design didn't make much headway in foreign markets.

Is there a definitive list of what #2, etc means? The Robertson link here: http://en.wikipedia.org/wiki/List_of...ives#Robertson seems to try, but skips over a 2mm hole in the screw head.
Yeah, that's kinda weird. I guess it's either a yellow-handled, or a green-handled screwdriver.

I just eyeballed my green-handled screwdriver with a measuring tape and think it would work. Both the driver and head are tapered, so there's some leeway. The yellow-handled driver will definitely fit, but might have too much slack for hard torquing.

There's some overlap in sizes, just like Philips actually.
#15
Old 05-27-2015, 08:52 PM
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For future reference, should you run across them, the six-point ones are called Torx head screws.
#16
Old 05-27-2015, 09:05 PM
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Robertson heads come in 4 sizes:

0 (yellow) Found on #4 screws, tiny and not common
1 (green) Found on #6 screws
2 (red) Found on #8 and #10 screws, by far the most common
3 (black) Found on #12 and #14 screws, pretty damn beefy

Contrary to what Leaffan suggests, I cannot recommend trying to use the wrong size driver with a Robertson screw. The next larger size will not enter the recess at all, and the next smaller size will do nothing but round out the hole. It's also important to know that you can easily strip out Robertson screws while using a power driver if you don't have the driver perfectly aligned. With hand drivers this isn't an issue as you can feel when the alignment is off.

If you like, I can hunt down my calipers and give you the precise dimensions of each size.
#17
Old 05-27-2015, 09:19 PM
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Yeah sounds like a Robertson #0. Robertsons certainly do strip, and the bits wear out quickly if they skip/strip at all. Using a six inch bit or extension greatly aids maintaining proper alignment.

You can find multiple bit sets at Home Depot / Lowes etc. that will give you a selection of Phillips, Robertson, Torx bits and maybe hex bits, nut drivers and a few drill bits. Usually multiple options from multiple brands too. There are also some pretty nice multi bit screw drivers also such as Picquic that have models featuring a Robbie #0. There are always several to choose from on sale. Cheap. Something any one the least bit inclined to ever try to fix anything should have around the house.
#18
Old 05-27-2015, 09:28 PM
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Quote:
Originally Posted by Gorsnak View Post
....
Contrary to what Leaffan suggests, I cannot recommend trying to use the wrong size driver with a Robertson screw. ......
I never suggested using the wrong sized driver at all. In fact I stated that the yellow-handle might not provide the desired results.
#19
Old 05-27-2015, 09:41 PM
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I'm told the micrometer measurement of the interior side to side distance is .083 inches. That's why I'm a bit confused, using that Wikipedia table. So we're looking at a #1? The local Lowe's Hardware only goes down to a 4mm hole size, I'm told.
#20
Old 05-27-2015, 10:13 PM
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Quote:
Originally Posted by Leaffan View Post
I never suggested using the wrong sized driver at all. In fact I stated that the yellow-handle might not provide the desired results.
Sorry, I took your "overlap in sizes" comment to suggest you could get away with wrong-sized drivers.
#21
Old 05-27-2015, 10:34 PM
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Quote:
Originally Posted by Cardinal View Post
I'm told the micrometer measurement of the interior side to side distance is .083 inches. That's why I'm a bit confused, using that Wikipedia table. So we're looking at a #1? The local Lowe's Hardware only goes down to a 4mm hole size, I'm told.
That's within a couple thous of my measurement of the tip of my #1 robbie driver, so yeah.

Lowes does seem to have them.

Home Depot shows them in both Husky and, if you're wanting to splurge, Klein.

Yes, I was careful to check the US sites and not Canadian.
#22
Old 05-28-2015, 10:25 AM
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Since the OP's question has been answered I'll chime in and recommend McFeelys (mcfeelys.com) as my favorite source for all things square-drive. I do some woodworking and love Robertson screws, they work so much better than Phillips; never cam out and the screw sticks to the bit so you can start a screw one-handed at any angle without it falling off the driver.

McFeelys has a wide variety of bits and fasteners including stuff like R2 head #6 screws (so you don't have to swap bits when you switch between #6 and #8 screws), undersized bits for use with heavily-plated exterior screws, Promax screws with unthreaded & overall shank lengths sized specifically to fasten common sizes of wood together, etc.

My wife cannot understand how I can happily sit there flipping through a catalog of screws :-)
#23
Old 05-28-2015, 11:48 AM
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I've bought from them in the past too. Great catalogue as you say.
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