> 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.
>
> Basically, I have a circuit board which will be inside a case and needs to
> be mounted
> to the case with about 2-4mm standoff.  Screws can only come from outside;
> access
> on the inside is good enough to align the board to a hole but not good
> enough to
> allow a PTH/nut solution.  Board is not thick enough to thread a PTH,
> either.
>
> Name for this part? Search terms? Companies that deal in such?
>
> Mike H.

> 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.
>

> Screw from PCB side is impossible; no access.  Also, since this is a
> redesign and the case involved is cast, I can add holes or remove
> material but not add material.  That is a problem, too.
>
> Dwayne's product is pretty much exactly what I need albeit larger
> than I'd really like.
>
> Adhesives MAY be acceptable but reliability issues may preclude that.
>
> Mike H.
>
> On Fri, Jun 11, 2010 at 11:13 AM, RussellMc <@spam@apptechnzKILLspamgmail.com> wrote:
>
>> 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.
>>

> > Screw from PCB side is impossible; no access
>
> Do you mean "no access after PCB installation" or "no access even during
> manufacture" ?
>
> My screws are assembly time items, so go on the board with everything else.
>
> > since this is a redesign
>
> If the redesign does not include a new PCB then I can understand the screw
> prohibition.
>
> If there are new PCBs made I assume it means that the system is so packed
> that there is no room for a screwhead that is wider than a tower. Head
> height is presumably not the issue?
>
>
>              R