[R-390] Tinnerman nuta II

[Fred Olsen]

Perry Sandeen wrote:
> suspect that your non-tapped holes are probably 1/4 inch.  If tapped out to 5/16 or 3/8  and you
> use even the lowest grade steel bolt it should be all you need for BA’s.

Except that the standard panel hole or notch height is 0.278 inches. 
Anything more than 1/4" hardware would require drilling out the panel. 
Something like Tinnerman Multi-Thread U-Nuts is what is customarily used 
in unthreaded rack supports, with a 10-32 thread.
http://www.tinnerman.com/DS.asp?V=1&C=78&C1=121&S=1&SC=Multi-ThreadUnuts-LUGS_sch.jpg#

A deep heavy chassis, such as a 390, is NOT intended to be mounted by 
the panel alone and doing so can easily cause damage.  L rails must be 
used between the front and rear support columns, or at least brackets of 
some sort from the rear of the chassis to the rear of the cabinet.  It 
is of course much easier and more secure to slide the unit in and out on 
support rails.

Fred
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