I have some PEMS solder-on studs (samples), and they're nice, but have a relatively large OD. Not at the office today, so I don't have the specifics with me now. Another option you may look into is rivet nut (or "rivnuts" as I've always known them). You can "rivet" these threaded nuts from the underside, and screw a standoff etc into them... http://www.mcmaster.com/#aluminum-rivet-nuts/=7hmzjf Harbor Freight should have a lower-cost kit of these too. Cheers, -Neil. Quoting Mike Hord : > 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 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. >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist