+/- 10% is standard, and must be specified either as MMC/LMC or
show actual tolerance at nominal dimension

                -----Original Message-----
                From:   Jack Olson [mailto:[log in to unmask]]
                Sent:   Wednesday, February 17, 1999 7:39 PM
                To:     [log in to unmask]
                Subject:        [DC] PCB thickness & tolerance

                This is such a lame question, but:
                I can't seem to find the reference in IPC documents
                regarding board thickness and tolerance,

                Except in IPC-D-275 5.2.4 it says
                "Board thickness shall be specified on the master
                drawing and unless otherwise specified, shall include
                metallic deposition"

                I have always heard the tolerance should be +/-10%
                (.062 +/- .007, for example)

                But I can't find it!   help.....

                Jack
                p.s. If someone specified a thickness as ".093 nominal"
                what would be acceptable on incoming inspection?

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