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counterbore slot   Dan counterbore slot

Do not worry about it, I always use a slot drill for counterbores, the standard counterbores always use a larger guide pin than I use for the thread clearance

Use this chart to find out what size counterbore hole to use for your ANSI Metric socket cap head screws and bolts  CAD: Counterbore Slot CAD-CAM Quick Tip Video Today's CNC software Quick Tip takes a look at the steps you would take to draw a Counterbore

double digger slot Buy Counterbore Mould End Mill Cutter Solid Slot Bit ~ Pilot Slotting Tool at  Use this chart to find out what size counterbore hole to use for your ANSI Metric socket cap head screws and bolts