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I'm trying to put together a DIY computer rack; the thing is, I've never seen one in real life.

My question is: Do i need rack rails in the back also, or can the front end of the unit/front rack rails handle the weight of a 3U/4U computer?

The length of the rails would be about 1 meter each.

I'm thinking of either aluminum or steel rails.

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It depends on the weight of the computer and the gauge of the rails! You need to be more specific. –  Shinrai Jun 23 '11 at 22:14
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The plates on the front of a rack-enabled 3u/4u case are designed to hold the weight, if that is all you were provided. If you buy a case that has back rails too, then be sure and use them, they were provided for a reason. –  MaQleod Jun 23 '11 at 22:15
    
@Shinrai : I'm not sure what gauge of the rails means, but if it means thikness i think the steel ones i've been looking at are 2mm. On the alu rails i could not see any given thikness on the store. –  Kanonskall Jun 23 '11 at 22:20
    
@MaQleod I'll keep that in mind, thanks! –  Kanonskall Jun 23 '11 at 22:25
    
I got the rack cabinet today, and there was no back rails (chieftec.eu/…) . What worries me is that the thing is pretty heavy, even with no hardware inside (17,8 kg according to chieftek), and i'm no metallurgist but the front rail mounts looked pretty spindly and appeard to be screwed onto the actual cabinet by 3 screws on each. :( –  Kanonskall Jun 29 '11 at 19:22

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