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Form Factor Specs.

S

SilentDoh!

Weaksauce
Joined
Feb 12, 2007
Messages
70
I would like to find the measurements for an ATX case and a Micro ATX cases not just the outside dimensions but the measurements for everything on the backside of the case. For example mounting holes for the power supply, the distance between card slote, etc. Does anyone know where I could find the engineering specs for these cases? I realize there are all shapes and sizes so I am just looking for the standard size case dimensions.
I want to build a couple of cases using the fancy cnc machines at the Techshop to cut out the parts.
Any help is appreciated.
 
formfactors.org should have most of that information. I don't think there is a specific size requirement for the exterior of the case, just where the standoffs are, the I/O shield, expansion slots and the like.
 
Thank you I have seen that site before they have mobo specs but nothing for case layout that I could find. I was hoping someone here might design tower or server cases that could help me find the specs I am looking for.
 
SilentDoh! said:
Thank you I have seen that site before they have mobo specs but nothing for case layout that I could find. I was hoping someone here might design tower or server cases that could help me find the specs I am looking for.
Click to expand...
I've designed and made a few cases from scratch. Dimensioning and configuration are sort of open to interpretation. Depends on components used and what volume you're trying to fit it all in. What exactly are you looking for?
 
Formfactor.org does have some chassis things. In The ATX Specification v2.1 , page 17 has the dimensions for the motherboard mounting holes, page 15 has the IO Connector dimensions, and page 12 has the distance between the PCI cards. Most everything else (like the PCI slot dimensions) you'll want to just grab a ruler and start measuring out a chassis you have on hand.

Power supply measurements can also be found at formfactor.org in the Power Supply Design Guide for Desktop Platform Form Factors document. Specifically page 72/73

Measurements for things like hard drive screw locations you just need to do some searching online. Make sure you pay attention to PDF documents and give them a scan since they are more likely to have actual dimensions. For example, hard drive dimensions can be found on page 37 of this document.
 
Form factor only really refers to motherboard compatibility. For example, the Storm Sniper Scout is technically a mid-tower case (a very cramped mid-tower case) while being as big on the outside as many full towers.

First you need to figure out how much space you want / need and then work from there.
 
Xiun said:
Formfactor.org does have some chassis things. In The ATX Specification v2.1 , page 17 has the dimensions for the motherboard mounting holes, page 15 has the IO Connector dimensions, and page 12 has the distance between the PCI cards. Most everything else (like the PCI slot dimensions) you'll want to just grab a ruler and start measuring out a chassis you have on hand.

Power supply measurements can also be found at formfactor.org in the Power Supply Design Guide for Desktop Platform Form Factors document. Specifically page 72/73

Measurements for things like hard drive screw locations you just need to do some searching online. Make sure you pay attention to PDF documents and give them a scan since they are more likely to have actual dimensions. For example, hard drive dimensions can be found on page 37 of this document.
Click to expand...

Thanks I went through all that before I started this thread I have been doing a lot of looking around before and since this thread. I was hoping to find more details about the atx standard than that. I would have never thought that when a company decides to start making cases they would have to reverse engineer all of these specs.I am just doing it for the experience.
 
i emailed IEEE to see what they knew about all this and this is what they said in their reply
. "The IEEE never became involved with the *TXchassis definitions. Intel and the WinTel consortium created these definitions. The IEEE did develop a series of internationalspecs for soft metric and hard metric chassis/boards. These are theIEEE 1101.x and 1301.x family of standards and are available in the IEEEStandards Store at http://www.techstreet.com/ieeegate.html. (Search for 1101 and 1301).

So if I can't find any more free information I may have to buy one of their pdf's and go from their specs which is kinda expensive.
 
Does this help any?

"High precision, low detail blank models of ATX, MATX, Mini-ITX and HPTX form factor motherboards w/mounting holes and IO opening + standard single/dual slot and low profile PCIe cards in their proper relationship to the MB" in SketchUp file format.
 
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