I think even here in the US, square holes and M6 cage nuts and screws are 
pretty much standard.  At least in data centers.  Telco might still use 12-24.

From: Eric Kuhnke 
Sent: Tuesday, March 29, 2016 9:45 PM
To: af@afmug.com 
Subject: Re: [AFMUG] Super long rack screw

I've seen lots of M6 in the stuff from China, and of course 12-24 and 10-32 
from US sources...  But never M5.


On Tue, Mar 29, 2016 at 7:41 PM, Ken Hohhof <af...@kwisp.com> wrote:

  Rack screw can be 10-32, 12-24, M5, M6.  And rack rail can be threaded, round 
hole, square hole.  Too many options.

  -----Original Message----- From: Cassidy B. Larson
  Sent: Tuesday, March 29, 2016 9:24 PM 

  To: af@afmug.com
  Subject: Re: [AFMUG] Super long rack screw

  I know on Cisco switches you could turn the ears around and the holes would 
line up so you’d get more switch in front of the rails.



    On Mar 29, 2016, at 8:22 PM, Sterling Jacobson <sterl...@avative.net> wrote:

    That's a good idea.

    If there are not holes, is there a small screw type that is short and 
self-tapping?

    Not sure the best way to mount the ears if the holes for the ears don't 
exist on the switch.

    -----Original Message-----
    From: Af [mailto:af-boun...@afmug.com] On Behalf Of Chuck McCown
    Sent: Tuesday, March 29, 2016 8:10 PM
    To: af@afmug.com
    Subject: Re: [AFMUG] Super long rack screw

    Add mounting ears farther back on the switch.

    -----Original Message-----
    From: Sterling Jacobson
    Sent: Tuesday, March 29, 2016 7:57 PM
    To: 'af@afmug.com'
    Subject: [AFMUG] Super long rack screw

    This is really specific; don't ask why I need it :)

    But I need a standard rack threaded screw that looks like a 6 to 7 inch 
long motherboard standoff screw.

    So it would stand a 1U switch forward from the 19" rack about 6-7 inches.

    I tried standard rack standoff modules, but the space is too limiting.





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