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September 2002

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TechNet <[log in to unmask]>
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"Dan R. Johnson" <[log in to unmask]>
Date:
Thu, 12 Sep 2002 11:02:03 -0700
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Subject:
Re: Hole size specification
From:
Eddie Rocha <[log in to unmask]>
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For plated thru holes, a typical tolerance is +/-.003" . Now if we're
talking about vias ( where no leads are to be inserted) the tolerance
should not be critical, so a tolerance of +.003 / - (the diameter) is
what I always recommend. This allows the fabricator to choose the
most cost effective drill diameter for the associated pad.
Hope this helps,

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