Replace dull edges instead of buying new counterbores to reduce costs during high-volume jobs. These kits come with all you need to cut precise port holes for hydraulic fittings, including a holder and two types of replaceable inserts. The pilot insert guides the counterbore as it penetrates material, and the form inserts finish the hole to the exact size you need. Secure the inserts with the included screws so they stay in place, even at the high speeds of your CNC machine. These kits meet aerospace and military specifications for leakproof port holes, so fittings stay sealed over time, even during sudden pressure and vibration. When you need to cut threads in the hole, use the included thread mill.

Replacement inserts come factory sealed from the manufacturer for maximum traceability. The replacement form insert screw for 9816N12 can also be used to secure the pilot insert.