Typically, a drilled feature to artwork feature tolerance of +/-.005" is achievable when fabricating a board, using standard processing. At HADCO, we have done some volume work with a requirement of +/-.003" from tooling hole (non-plated) to fiducial (artwork) by using glass artwork. Your NRE will be a little costlier here, but processing should allow acceptable yields, so as not to adversely affect the basic price of the board. Tom Coyle Field Services Engineer HADCO Corporation [log in to unmask] P.S.: Boards were inspected using a View Precis.