MicroATX Mobo Standoff Hole Position (Hole R&S)

[LjSpike]

After looking through both the MicroATX and ATX spec's, I don't seem to be able to determine the position of holes R & S accurately (in the horizontal direction if rear I/O is up). I'm also questioning the if I have the position of B in the horizontal direction correct (I have the gap from B to C as 47.75mm, and the gap from A to B as 78.74mm).

Just wondering if someone else whose worked out these dimensions can help me out here. I've got the rest of the dimensions nicely worked out.

 

[LjSpike]

Bump

 

[LjSpike]

Bump again as It'd be quite useful to work out the case holes. This time I'm expecting I'll be doing Mini-ITX, however next time it'd be nice to sort out a micro-ATX SFF design which would mean I'd need to work out those holes.

 

[jtd871]

They're in the specs.
In the ATX Spec 2.1, see Figures 2 and 3 for ATX and microATX hole placement. http://formfactors.org/developer/specs/atx2_1.pdf
For mini-ITX, see pages 9 and 10 of http://formfactors.org/developer/specs/Mini_ITX_Spec_V2_0.pdf

 

[LjSpike]

They're in the specs.
In the ATX Spec 2.1, see Figures 2 and 3 for ATX and microATX hole placement. http://formfactors.org/developer/specs/atx2_1.pdf
For mini-ITX, see pages 9 and 10 of http://formfactors.org/developer/specs/Mini_ITX_Spec_V2_0.pdf

Figure 2 doesn't give the positions of the holes, and the diagram isn't to scale. Figure 3 omits holes R & S. All the other holes I have worked out, but it's those pesky two holes. Additionally, ATX makes it appear as if S and B are in line, however mini-ITX makes it appear that R & B are in line.

EDIT: Found another specification document that gives R&S positions - http://www.formfactors.org/developer/specs/matxspe1.2.pdf Page 12 (figure 3)

 

[neilhart]

Bump again as It'd be quite useful to work out the case holes. This time I'm expecting I'll be doing Mini-ITX, however next time it'd be nice to sort out a micro-ATX SFF design which would mean I'd need to work out those holes.

With reference to this specification, page 12;

http://www.formfactors.org/developer/specs/matxspe1.2.pdf

Both the R and S holes lay at -154.94 mm below the Datum B 0,0

The R hole is -20.32 mm from a vertical line from the Datum B 0,0

The S Hole is inline with the Datum B 0,0

I have noticed over the years that some case and motherboard manufactures do not agree with this specification. Best practice is too check the case to the motherboard and correct the stand off location as needed.

Good luck with your project,
neil

 

[LjSpike]

With reference to this specification, page 12;

http://www.formfactors.org/developer/specs/matxspe1.2.pdf

Both the R and S holes lay at -154.94 mm below the Datum B 0,0

The R hole is -20.32 mm from a vertical line from the Datum B 0,0

The S Hole is inline with the Datum B 0,0

I have noticed over the years that some case and motherboard manufactures do not agree with this specification. Best practice is too check the case to the motherboard and correct the stand off location as needed.

Good luck with your project,
neil

Thanks. I'm designing it generally as a concept, maybe at some point in the future i'll produce them and I may sell off some.