# What's the name for a 2mm square hole in a screw head?

**URL:** <https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999>\
**Category:** Factual Questions\
**Created:** [May 27, 2015, 11:11pm UTC](https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999 "2015-05-27T23:11:29Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![Gorsnak](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/gorsnak/32/7587_2.png) [@Gorsnak](https://boards.straightdope.com/u/Gorsnak)\
**Post date:** [May 28, 2015, 2:34am UTC](https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999/21 "2015-05-28T02:34:54Z")

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> [@Cardinal](#):
>
> 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](http://www.lowes.com/pd_445720-48412-54134_1z1199tZ1z11pcd__?productId=4428158&pl=1).

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.

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**Author:** ![Valgard](https://avatars.discourse-cdn.com/v4/letter/v/7feea3/32.png) [@Valgard](https://boards.straightdope.com/u/Valgard)\
**Post date:** [May 28, 2015, 2:25pm UTC](https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999/22 "2015-05-28T14:25:05Z")

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Since the OP’s question has been answered I’ll chime in and recommend McFeelys ([www.mcfeelys.com](http://www.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 🙂

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**Author:** ![GaryM](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/garym/32/241_2.png) [@GaryM](https://boards.straightdope.com/u/GaryM)\
**Post date:** [May 28, 2015, 3:48pm UTC](https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999/23 "2015-05-28T15:48:19Z")

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I’ve bought from them in the past too. Great catalogue as you say.

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**Author:** ![Leaffan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/leaffan/32/299_2.png) [@Leaffan](https://boards.straightdope.com/u/Leaffan)\
**Post date:** [May 28, 2015, 4:13pm UTC](https://boards.straightdope.com/t/whats-the-name-for-a-2mm-square-hole-in-a-screw-head/720999/25 "2015-05-28T16:13:14Z")

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Reported.

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