Iscar 3401166 Corner Radius End Mill 1/2 in 4 Flute Carbide

Product Description

The ISCAR 3401166 is a solid carbide corner radius end mill from the ECI-4-VF series, designed for high-performance material removal in demanding machining applications. It carries a 1/2 inch mill diameter, a 2-1/2 inch length of cut, and a 0.06 inch corner radius. The cutting geometry features 4 flutes with a variable index and right-hand spiral flute direction. An AlTiCrSiN PVD coating applied via physical vapor deposition provides heat and wear resistance during aggressive milling passes. The Weldon flat shank and h6 shank tolerance ensure secure, repeatable clamping in compatible toolholders. Overall length is 5 inches and shank diameter is 1/2 inch. This tool is suited for both roughing and finishing operations and is installed by machinists in CNC milling environments.

This end mill is built for use on steel, stainless steel, cast iron, superalloys, titanium, and hard materials, covering ISO material groups P, M, K, S, and H. The extra-long length type with a 2.5 inch reach makes it well suited for deep-pocket milling, shoulder milling, and contour work where standard-length tools cannot reach. The centercutting design allows plunge entry directly into the workpiece. It is intended for use with a compatible toolholder in CNC vertical or horizontal machining centers where rigid setup and proper speeds and feeds are maintained for the target material.

Key Features

• AlTiCrSiN PVD coating for wear resistance in steel, stainless, cast iron, superalloys, and hard materials
• Variable index flute spacing reduces harmonic vibration during heavy cuts
• Corner radius of 0.06 inches strengthens the cutting edge and improves surface finish at corners
• Centercutting geometry allows direct plunge milling without pre-drilling
• Weldon flat shank with h6 tolerance provides positive engagement and runout control in toolholders
• Extra-long reach of 2.5 inches suits deep-cavity and deep-pocket applications

Compatibility

Designed for use with a compatible toolholder. Catalog reference ECI-4 500-2.5W06VF5 identifies this tool within the ISCAR ECI-4-VF series. Suitable for CNC milling setups targeting steel, stainless steel, cast iron, superalloys, titanium, and hard workpiece materials.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the tool is securely seated and torqued in the toolholder before starting the machine. The Weldon flat must align with the toolholder setscrew for proper drive. Verify speeds, feeds, and depth of cut against the material being machined and the machine's rigidity before initiating a cut.