Iscar 3398420 Corner Radius End Mill 0.5 in 5 Flute Carbide

Product Description

The ISCAR 3398420 is a solid carbide corner radius end mill designed for high-performance material removal in demanding machining environments. Part of the ECI-5-VF series, it features a 0.5-inch diameter with a 0.030-inch corner radius, five variable-index flutes, and an AlTiCrSiN PVD coating that provides thermal and wear resistance during aggressive cuts. The right-hand spiral flutes are suited for both roughing and finishing operations. With an overall length of 2.5 inches and a 1.26-inch length of cut, this tool fits standard straight-cylindrical toolholders with a 0.5-inch shank diameter held to h6 tolerance.

This end mill is built for machinists working in steel, stainless steel, cast iron, superalloys, titanium, and hard materials. The extended-reach geometry and short flute length make it well suited for shoulder milling, profiling, and slotting in tight-clearance workpiece features. Its variable index flute spacing helps dampen chatter during high-speed cutting passes, making it appropriate for both conventional CNC machining centers and high-efficiency milling strategies on production floors.

Key Features

• 0.030-inch corner radius reduces stress concentration at the cutting edge and extends tool life in hardened materials
• AlTiCrSiN PVD coating provides oxidation resistance and hardness retention at elevated cutting temperatures
• Five variable-index flutes support chatter-free roughing and finishing in a single tool
• Extended-reach design with 0.625-inch reach length accommodates deeper feature access
• Solid submicron carbide grade delivers consistent edge integrity across P, M, K, S, and H material classifications
• Right-hand cutting, right-hand flute direction with straight-cylindrical shank for broad toolholder compatibility

Compatibility

Designed for use with standard straight-cylindrical toolholders accepting a 0.5-inch shank diameter. Manufacturer catalog cross-reference number ECI-4 1.0-1.5/3.0C125VF5. Suitable for machining steel, stainless steel, cast iron, superalloys, titanium, and hard materials per ISCAR material classification codes P, M, K, S, and H.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer torque and runout specifications. Confirm shank seating depth and verify h6 shank tolerance compatibility with the collet or end mill holder before clamping. Disable the spindle and lock out machine power before inserting or removing the tool. Do not exceed the toolholder manufacturer recommended overhang for the selected reach length.