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Author Topic: Model F screws--what size are they? Anybody know?  (Read 1839 times)

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Offline vivalarevolución

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Model F screws--what size are they? Anybody know?
« on: Thu, 13 February 2014, 19:36:36 »
My Model F came with two screws that actually were Model M screws.  I'm wondering if anybody knows the exact screw size for screws that hold together the case of the Model F.
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Offline fohat.digs

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Re: Model F screws--what size are they? Anybody know?
« Reply #1 on: Thu, 13 February 2014, 19:49:42 »
Aren't they the same? 7/32"
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Offline E TwentyNine

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Re: Model F screws--what size are they? Anybody know?
« Reply #2 on: Thu, 13 February 2014, 20:34:43 »
Quote from: fohat.digs on Thu, 13 February 2014, 19:49:42
Aren't they the same? 7/32"

Model F AT is 1/4"
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Offline vivalarevolución

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Re: Model F screws--what size are they? Anybody know?
« Reply #3 on: Thu, 13 February 2014, 20:55:07 »
Oops, sorry for the Model F 122.  They are the same head size as the Model M, but the Model F screws have more threads.  The Model M screws will not stay tight in a Model F case.
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Offline fohat.digs

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Re: Model F screws--what size are they? Anybody know?
« Reply #4 on: Thu, 13 February 2014, 21:14:55 »
Quote from: prdlm2009 on Thu, 13 February 2014, 20:55:07
Oops, sorry for the Model F 122.  They are the same head size as the Model M, but the Model F screws have more threads.  The Model M screws will not stay tight in a Model F case.

That makes sense. Like everything on the Model M, they are cheaped-down and simple compared to the F. Model M screws just go into plastic and need rough threads, while the F has metal sleeves inset into plastic stems to receive machine screws.
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Offline vivalarevolución

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Re: Model F screws--what size are they? Anybody know?
« Reply #5 on: Fri, 14 February 2014, 06:19:16 »
Quote from: fohat.digs on Thu, 13 February 2014, 21:14:55
Quote from: prdlm2009 on Thu, 13 February 2014, 20:55:07
Oops, sorry for the Model F 122.  They are the same head size as the Model M, but the Model F screws have more threads.  The Model M screws will not stay tight in a Model F case.

That makes sense. Like everything on the Model M, they are cheaped-down and simple compared to the F. Model M screws just go into plastic and need rough threads, while the F has metal sleeves inset into plastic stems to receive machine screws.


Yea, and those Model M screws strip the metal sleeves on Model F case.  I'm worried that the correct screws will have trouble sitting correctly, if I ever find the right ones.
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Offline fohat.digs

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Re: Model F screws--what size are they? Anybody know?
« Reply #6 on: Fri, 14 February 2014, 11:45:28 »
The screws are metric, amazingly.

M4 - .7 x 14mm with an undersized hex head and flange. Home Depot sells M4-.7x12mm in either pan head Philips screw with a head about the same size as the original flange, or a hex bolt with a much larger head. The 12mm is a bit shorter than the original but should work OK.

I am glad that you brought this up, I needed a couple myself.

With luck, the new threads will re-mould the insides of the sleeves, at least partially.
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Offline vivalarevolución

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Re: Model F screws--what size are they? Anybody know?
« Reply #7 on: Fri, 14 February 2014, 16:56:08 »
Quote from: fohat.digs on Fri, 14 February 2014, 11:45:28
The screws are metric, amazingly.

M4 - .7 x 14mm with an undersized hex head and flange. Home Depot sells M4-.7x12mm in either pan head Philips screw with a head about the same size as the original flange, or a hex bolt with a much larger head. The 12mm is a bit shorter than the original but should work OK.

I am glad that you brought this up, I needed a couple myself.

With luck, the new threads will re-mould the insides of the sleeves, at least partially.

Thanks.  I would shoot out to the hardware store right now, but it's current Snowpocalypse, Part 4, out there right now, so I will wait until tomorrow.
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Offline semyorka

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Re: Model F screws--what size are they? Anybody know?
« Reply #8 on: Fri, 14 February 2014, 23:45:42 »
If you're buying new bolts that don't quite match the originals, I'd just get some M4 x 14mm cap screws from McMaster.  Something like ~$8 for 50 in 18-8 stainless steel.  They've got some nice black-oxide coated ones as well.

I can't imagine that the threads are damaged to the point that chasing them with a tap won't clean them up.
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Offline 0100010

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Re: Model F screws--what size are they? Anybody know?
« Reply #9 on: Sat, 18 October 2014, 19:09:48 »
Necro post.

4704 boards also use M4 x.07 screws on the case.
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