> "We've built all these assemblies, many, many times without issue."
you means Siemens didn't have the dissimilar metal coupling check?   
Build is not an issue, corrosion in the field and resistance change  
might be...  it is reliability issue.  if your stuff only work on one  
shot deal (like bomb), and you just engage the two parts upon short  
usage life, not much of issue, if you are in the field for long time  
- like more than 3 month, you should consider dissimilar metal  
coupling from the start of design phase - use some good material/ 
process engineer to select mating parts properly (according to  
standards).
better not be one of those electrical switches... not smart one  
either...
       jk
On May 27, 2016, at 10:43 AM, Kuczynski, Michael wrote:

> We've been using ENIG finish for our PCB's and installing tin  
> plated hardware (self clinching, broaching nuts and standoffs)
>
> We use anywhere from 1 or 2 pieces, to maybe a dozen, of this  
> hardware on various assemblies.
> These items are used just to hold or mount some items in place (no  
> serious stress on these items).
>
> Our mfg/assy facility in EU is balking at the finish mismatch and  
> suggesting we change the board finish to immersion tin (which we've  
> never used).
>
> We've built all these assemblies, many, many times without issue.
>
> Is there any other merits I should consider, before I tell them  
> please build them as is?
>
>
> Michael Kuczynski
> Mgr. ECADS - Electrical  511 Benedict Ave.
> 914-524-3118 (Ph)            Tarrytown, NY 10591
> 914-524-3322 (Fax)           Mail Stop P25-1-C
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