Hi all,

I was looking for an international standard which describes the tolerances on the dimensions of press-fit holes, since we had some troubles in production.  I did not found anything in IPC, but I did in IEC-60352-6.
In this standard they did not make a difference between Sn-Pb finish and electroplated or immersion finish.  I think this is strange since Sn/Pb has better smearing properties than the other finishes, and therefore can have other tolerances on the finishes
hole diameter.  In the table they also make a difference between the diameter prior to plating and after plating.  Can anyone tell me if it is necessary to define the drill diameter?  In my opinion, the copper thickness in the hole and the finished hole
diameter are the only parameters which are of importance.  Another strange thing is that comparing the different hole diameters, the difference between the drilled and finished hole is not always the same.
Can someone help me out of this?

Thanks,

Inge, Alcatel

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