One word of caution when choosing your pad sizes and inner layer
clearances, base them on the component diameter and not the specified
hole size. The diameter of the part is normally some .015 larger than the
finished hole size specified and should be taken into account in your
design.

Another problem that comes up is that many of these fasteners require
a +.003, -.000 tolerance on the finished holes. When placing in
nonplated holes this is not much of a problem. If using plated holes this
tolerance is too tight for a large plated thru hole. We have been very
successful using a +.004,-.001 finished hole size tolerance. 

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