Cleveland C40066 Corner Radius End Mill 3/4 in 3 Flute Ticn

Product Description

The CLEVELAND C40066 is a corner radius end mill engineered for precise milling operations in ferrous and non-ferrous materials. Built to PM-538R series standards, it features a 3/4 inch cutting diameter and a 0.12 inch corner radius that reduces stress concentrations at the tool edge, extending tool life and improving surface finish on radiused pockets and shoulders. The 3-flute, right-hand spiral geometry paired with a TiCN coating delivers higher hardness and lower friction than uncoated tooling. With a 2-1/2 inch length of cut and centercutting capability, it handles both plunge and peripheral milling without a separate drilling operation. Total weight is 0.8 pounds.

This end mill is suited for job shop and production floor use in CNC vertical and horizontal machining centers. The coarse pitch and 42-degree helix angle support aggressive material removal while maintaining chip evacuation in deep pockets. Applications include roughing and semi-finishing of mold cavities, die work, and structural components requiring radiused corner profiles. It is installed by machinists and CNC operators working with steel, alloy steel, stainless, and cast iron workpieces.

Key Features

• 3/4 inch cutting diameter with 0.12 inch corner radius for radiused shoulder and pocket work
• TiCN coating increases surface hardness and wear resistance over uncoated or TiN-coated tools
• 3-flute, right-hand spiral design balances chip load and surface finish
• Centercutting geometry allows direct plunge entry without pre-drilling
• 42-degree helix angle promotes efficient chip evacuation in deep-cavity cuts
• 3/4 inch shank diameter for rigid tool holding in standard ER and side-lock holders

Compatibility

Designed as an OEM-style replacement and production tooling option for CNC machining centers and manual mills accepting a 3/4 inch shank end mill holder.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and locked out before inserting or removing the tool from the holder. Use a calibrated torque wrench on collet nuts or set-screw holders to achieve proper clamping force without distorting the shank. Confirm runout with a dial indicator before initiating a cut, as excessive runout accelerates corner radius wear and degrades surface finish.