BB Piloted Counterbore Cutter HSS Flat Bolt Hole Cap Screw

The counterbore symbol is used on a drawing to indicate that a counterbore hole feature is required A counterbore is a flat-bottomed

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counterbore slot callout Counterbored Holes Dimensions USA SOCKET-HEAD CAP SCREWS Screw dia Counterbore dia Counterbore depth Countersink dia Clearance dia

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