Iscar 3398091 Corner Radius End Mill 1/2 in 4 Flute Carbide

Product Description

The ISCAR 3398091 is a solid carbide corner radius end mill from the ECI-4-VF series, designed for demanding metal removal in both roughing and finishing operations. It features a 0.5 inch mill diameter, a 0.0300 inch corner radius, and four flutes with right-hand spiral geometry and variable index spacing. The AlTiCrSiN PVD coating provides thermal resistance and edge durability when cutting steel, stainless steel, cast iron, superalloys, titanium, and hard materials. The 38-degree helix angle and submicron carbide grade make this tool well suited for high-performance milling where surface finish and tool life both matter.

This end mill fits standard straight-cylindrical toolholders with a 0.5 inch shank diameter held to h6 tolerance. It is a single-end, centercutting design capable of plunge entry, making it versatile across a range of machining setups. Typical applications include profile milling, slotting, and finishing passes on hard and difficult-to-machine workpiece materials in CNC machining centers. The extended reach geometry supports deeper cavity work without requiring a longer overall assembly.

Key Features

• Solid carbide submicron grade construction for rigidity and edge retention in hard materials
• AlTiCrSiN PVD coating rated for steel, stainless steel, cast iron, superalloys, titanium, and hard material grades
• Variable index flute spacing reduces harmonic chatter during aggressive cuts
• 0.0300 inch corner radius reduces stress concentration and improves corner durability
• Centercutting design allows plunge milling without a pre-drilled entry hole
• Right-hand cut, right-hand spiral with standard pitch for broad toolholder compatibility
• Extended reach geometry supports deeper cavity and pocket milling applications

Compatibility

Designed for use with standard straight-cylindrical toolholders. ISCAR catalog reference ECI-4 500-1.25C03VF3. Shank diameter is 0.5 inch held to h6 tolerance for precise fitment in collet chucks, end mill holders, and hydraulic toolholders accepting a 1/2 inch straight shank.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. The machine spindle must be fully stopped and the toolholder assembly secured before inserting or removing the end mill. Verify runout after installation using an indicator before beginning a cut cycle. Follow the toolholder manufacturer torque and clamping procedures for the specific holder type used.