RF Connector Panel Drill Guides - SO-239 / N 4-hole Flange and BNC D-hole, with Check Key (free)

Two drill guides and a check key for the panel holes that radio projects keep needing: the 4-hole square-flange pattern used by SO-239 and N sockets, and the D-shaped hole for a BNC bulkhead. Line the notches up with a crosshair on your panel, tape the guide down, and centre-punch or pilot-drill through it. The four corner holes take a 3.2 mm bit. Scribed lines on top show the 16.3 mm centre hole, the 25.4 mm flange, and the outline of the BNC D, with the flat extended so you can square it up.…

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