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Straight Forward Motherboard Tray Screw Locations

post #1 of 11
Thread Starter 
I recently was working on my first case design and I found it particularly difficult to find information on the specific screw locations for the ATX, Micro ATX, and Mini ITX form factors. The information is out there, but a lot of modders and information sites point you towards just obtaining a cheap case or placing the motherboard down and marking the locations, but I wanted precise measurements.

I didn't initially intend to share this, but in the spirit of being new and actually contributing to the community, here you go! thumb.gif

All measurements are in inches with mm in brackets below.



Here's an example of what it looks like with those holes drilled in acrylic:

(Sorry, I don't have one without the logo or I would've posted it.)

I hope this helps someone! biggrin.gif
post #2 of 11
good one man , i got those measurments too biggrin.gif , and im going to compare mines with yours
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by yoi View Post

good one man , i got those measurments too biggrin.gif , and im going to compare mines with yours

Let me know if you find any discrepancies.

I'm working on some additional parts for my next case project.

This is what I have for a 5.25 bay side.



I based it on the ancient SFF-8551 document that Seagate still has floating around. Any input would be greatly appreciated on this one.
post #4 of 11
Very nice of you to share this, I know that I'll be finding this useful in the future! Thanks!
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post #5 of 11
yeah , the motherboard hole pattern is good , there is a CAD document somewhere floating arround the net , dont know if its from protocase or formfactor.org , but i have it and compared it and its the same

... now , the reall challenge :



aside from the motherboard i/o bracket , how to align it with the hole pattern from the ATX form factor , the spacing between motherboard and the bracket ( there has to be a spacing for the PCIe cards to slide in and pass through the motherboard tray )

i came arround that just by making the standoffs 9.5mm biggrin.gif , and leaving in between mobo and bracket 2mm

aside from that , i just put the bracket by just aligning it with the PCIe holes lol , i would like some specifics instead of doing that frown.gif
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by yoi View Post

yeah , the motherboard hole pattern is good , there is a CAD document somewhere floating arround the net , dont know if its from protocase or formfactor.org , but i have it and compared it and its the same

... now , the reall challenge :



aside from the motherboard i/o bracket , how to align it with the hole pattern from the ATX form factor , the spacing between motherboard and the bracket ( there has to be a spacing for the PCIe cards to slide in and pass through the motherboard tray )

i came arround that just by making the standoffs 9.5mm biggrin.gif , and leaving in between mobo and bracket 2mm

aside from that , i just put the bracket by just aligning it with the PCIe holes lol , i would like some specifics instead of doing that frown.gif

Which measure are you looking for? The distance between the top of the board's I/O panel and the first PCI slot?
post #7 of 11
nah , that complete part is accurate

what im trying to say is the assembly of those parts , the motherboard tray and the motherboard i/o bracket

im just putting it because i use a motherboard with PCIe cards mock up , and align it based on that frown.gif so , if i eliminate my fake motherboard , i dont know where to put the bracket on the motherboard tray
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by yoi View Post

nah , that complete part is accurate

what im trying to say is the assembly of those parts , the motherboard tray and the motherboard i/o bracket

im just putting it because i use a motherboard with PCIe cards mock up , and align it based on that frown.gif so , if i eliminate my fake motherboard , i dont know where to put the bracket on the motherboard tray

The I/O panel on the board actually extends beyond the board by 2.4384mm (0.096in) on the opening dimension. In your mock up is your I/O panel attached to the PCI brackets?

Somewhat related... I haven't started designing or measuring the panel for mine yet, so any measures you might have on that would be greatly appreciated.
post #9 of 11
i think im not explaining myself clear :

this is the right place :


BUT , how acurate ? how do i know its not like this :



or this:




...as you can see in my other post , i have a mobo with pci-e cards , that i can "align" and make it as acurate as the eye can see .. but i would like some sort of measurement , some standard ones . ive been looking for that but found nothing frown.gif

i hope u can see what im trying to say

PS my motherboard I/O bracket is as acurate as formfactor.org / protocase and some members at Bit-tech.net goes
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post #10 of 11
Thread Starter 
I understand what you mean. Here's what I was talking about.

According to the ATX standard, there is a 0.096 inch difference between the edge of the board and the edge of the I/O panel.




Unfortunately, I have found many other sources of information which seem to contradict this measurement, with some saying that the I/O cutout lines up perfectly with the board, and others even saying there is a small gap in the other direction.

Things are complicated even more by the fact that not all of the expansion port types have a consistent spacing on the ATX spec (and that AGP and ISA connector types are on the spec)

Here's a side view from the mATX standard which confirms that 0.096 inch measurement.

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