Iscar 3401138 Corner Radius End Mill 3/4 in 4 Flute Carbide

Product Description

The ISCAR 3401138 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 measures 0.75 inches in diameter with a 4-inch length of cut, a 7-inch overall length, and a 0.03-inch corner radius that protects the cutting edge and improves surface finish at part transitions. The tool features 4 flutes with a right-hand spiral flute direction, variable index geometry, and an AlTiCrSiN PVD coating for extended tool life at elevated cutting temperatures. The Weldon flat shank with an h6 shank tolerance provides secure clamping in compatible toolholders. Licensed machinists and CNC operators install this tool in milling centers running production work on steel, stainless steel, cast iron, superalloys, titanium, and hard materials.

This end mill is suited for production milling environments where a single tool must handle both roughing and finishing passes. The extra-long reach design at 4 inches allows access to deep pockets, walls, and complex contours that standard-length end mills cannot reach. The centercutting capability supports plunge entry into workpieces without a pre-drilled pilot hole. Primary workpiece material compatibility spans ISO material codes P, M, K, S, and H, making this tool appropriate for general job shops and aerospace or precision machining operations running titanium and nickel-based superalloys.

Key Features

• Submicron-grade solid carbide substrate for wear resistance in hard and abrasive materials
• AlTiCrSiN PVD coating provides thermal and oxidation resistance during high-speed cuts
• Variable index flute geometry reduces chatter and harmonic vibration during aggressive passes
• 0.03-inch corner radius protects the cutting corner and improves workpiece surface finish
• Extra-long reach at 4 inches LOC enables deep-pocket milling without extended-reach adapters
• Weldon flat shank with h6 tolerance ensures positive drive and repeatable runout in standard toolholders
• Centercutting design supports direct plunge milling without a pilot hole

Compatibility

Designed for use with compatible Weldon flat toolholders. Per supplier data, this end mill carries catalog reference ECI-4 750-4.0W03VF7 and is rated for steel, stainless steel, cast iron, superalloys, titanium, and hard materials under ISO material codes P, M, K, S, and H.

Installation Notes

Installation is performed by qualified CNC machinists or tool-and-die personnel. Ensure the machine spindle is fully stopped and locked out before tool changes. Seat the Weldon flat shank fully into the toolholder bore and torque the set screw per the toolholder manufacturer specification. Verify runout at the tool tip with a dial indicator before initiating a cut, and confirm cutting parameters match the workpiece material and coating rating.