Max diameter for motherboard stand-off?

[Mortis Angelus]

I need to make a custom stand-off for my custom case build; I need to suspend my mobo up from the case-floor about 3 cm. Like so: https://www.dropbox.com/s/e4csj6o3aamgpeq/Slide1.png?dl=0

But I obviously need to buy some materials for this, and thus I wonder, what is the recommended diameter for such a stand-off? I want maximum strenght, but I obviously don't wanna risk a short-out by having my metal stand-off touching sensitive circuits.

 

[10410039]

If you need that much height, it wouldn't be standoff, it'll be spacer. You could easily find a cylindrical one (not hexagonal like a usual standoff) made of aluminium. Screw size is usually a standard M3, and outer diameter will follow.

...and about the thickness, do you mean the thickness of the sheet or the standoff's wall ?

 

[Mortis Angelus]

...and about the thickness, do you mean the thickness of the sheet or the standoff's wall ?

I meant diameter of the spacer yes, because I know there is a max limit, as otherwise you start touching surrounding circuits on the mobo.

 

[10410039]

crap. I never measured one, but I found few picture that might be useful for references.
https://lh5.googleusercontent.com/-...II/AAAAAAAACMQ/7iYlcSjjDl0/s640/MtoF_Size.jpg
https://ae01.alicdn.com/kf/HTB14eCB...mm-Female-PCB-Motherboard-Standoff-Spacer.jpg
https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/ad3e3b8120b6ad4877c7e860d69a2b54/large.PNG

and this topic could be the answer to your question
http://www.tomshardware.co.uk/answers/id-2449956/motherboard-standoff-dimensions.html

 

[Mortis Angelus]

and this topic could be the answer to your question
http://www.tomshardware.co.uk/answers/id-2449956/motherboard-standoff-dimensions.html

Thanks! That last link had the answer: "...the standoff provided has to be a minimum of 6.5mm and the external cross section has to fit within a 10mm x 10mm area around the standoff hole."

So in my case, I will probably use an 8 mm solid steel rod and tap my own M3 holes. Thanks a lot mate!