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.

Replacement Pilot Inserts—Each of these inserts has three cutting edges for a long life—just rotate to a new edge when one becomes dull. They have a positive rake, which means the cutting edge is angled to reduce vibration and prevent thin workpieces from bending. Built-in chip breakers prevent long chips that can block the flow of coolant or damage your counterbore.

Inserts sold individually come packed in a clear plastic case to protect cutting edges during shipment. Inserts sold in packs come factory sealed from the manufacturer for maximum traceability.