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A plated through hole in a Printed Circuit Board that is used to provide electrical connection between a trace on one side of the Printed Circuit Board to a trace on the other side. Since it is not used to mount component leads, it is generally a small hole and pad diameter.

PCB Glossary

  • Drill File (Excellon Drill File)

    It will have X & Y coordinates with tool sizes viewable in any text editor. It is this file that governs your finished hole sizes.