I'm looking for a product (I'm reasonably sure it exists) which can be
affixed to a PCB to provide a conductive threaded anchor and standoff.
 Soldered down is
okay, swaged may be better.  Should be small- 2 to 2.5mm threaded hole with
an OD
as small as possible.

________

Your description doesn't seem to exclude the following as a possible
possibility.
As the nuts or threaded towers below are between the PCB and case and as any
screw and 'nut' tightening happens prior to PCB insertion it seems to fit
inside rule set.
But, my parser may be broken :-).


World  /   Case  //  tower  ( out-side  / PCB   / in-side )

1.  Is there enough room on the non-case side ("in-side") of the PCB for a
screw head, with screw facing through PCB towards wall.?

This would allow you to insert a screw from the in-side through the PCB into
a threaded tower on the PCB out-side.
The tower either has a thread protruding from the out-side to pass through
hole in case (may or may not violate the "screws can only come from outside"
spec) OR has a threaded hole. ie standoff notionally could be a 4mm long
tube with a say 2mm internal threaded hold right through it. A 2mm flat
headed screw enters its in-side through the PCB and another threaded screw
enters its out-side via the case.

Biggest issues seem to be

- Total thread length inside rod for threaded portions of two
counter-inserted screws is 4mm.

- Screw head on far side of PCB needs to be low enough to not annoy.

2.  The super enthused extend thread  length by using a hollow screw
inserted through the PCB.
Screw through PCB from in-side and add a nut (or towerlet) on out-side BUT
screw is hollow and threaded to form a tower for an external screw to thread
into. Tower width this way is somewhat larger than other ways.

*Could be achieved by drilling and tapping COTS screws with a smaller
internal hole.  *

3.  Is an adhesive based solution (at PCB end) tenable?  Conductive
requirement makes that harder.


                        Russell McMahon
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