Iscar 3398008 Corner Radius End Mill 1/4 in 4 Flute Carbide

Product Description

The ISCAR 3398008 is a solid carbide corner radius end mill engineered for high-performance material removal in demanding machining applications. Measuring 1/4 inch in diameter with a 0.015-inch corner radius, this tool runs as a single-end, centercutting design with four flutes and a right-hand spiral cut. The AlTiCrSiN PVD coating provides thermal and wear resistance suited to aggressive feed rates. With an overall length of 3 inches and a 1-inch length of cut, it handles both roughing and finishing operations without a tool change. The variable index geometry helps reduce chatter and extend tool life in difficult-to-machine materials.

This end mill is designed for use in CNC machining centers and manual mills where tight corner radii and surface finish quality matter. Its primary workpiece materials include steel, stainless steel, cast iron, superalloys, titanium, and hard materials. The extended reach design and long flute length make it well suited to deeper pocketing, slotting, and profile milling passes in production and job-shop environments. The straight-cylindrical shank with h6 tolerance mounts directly into standard end mill toolholders. Machinists working with difficult alloys and hard materials will find the submicron carbide grade and coating combination appropriate for these conditions.

Key Features

• Solid submicron carbide construction for rigidity and wear resistance in hard and abrasive materials
• AlTiCrSiN PVD coating rated for steel, stainless steel, cast iron, superalloys, titanium, and hard materials
• 0.015-inch corner radius reduces stress concentration at the cutting edge and improves corner life
• Variable index flute geometry reduces harmonic vibration and chatter during cut
• Centercutting design allows plunge entry without a pre-drilled hole
• Right-hand cut, right-hand spiral with normal pitch for predictable chip evacuation
• Extended reach and long flute type support deeper axial engagement in pocketing operations

Compatibility

Part of the ISCAR ECI-4-VF series, catalog number ECI-4 250-1.0C015VF3. Designed to mount in standard straight-bore end mill toolholders accepting a 1/4-inch straight-cylindrical shank with h6 diameter tolerance.

Installation Notes

Installation is performed by a machinist or toolroom technician. Ensure the toolholder bore is clean and free of chips before seating the shank. Confirm runout with a dial indicator before committing to full-depth cuts, particularly when machining superalloys or hardened materials. Follow machine tool manufacturer guidelines for collet or set-screw torque when securing the shank.