Iscar 3398265 Square End Mill 1/4 in 4 Flute Solid Carbide

Product Description

The ISCAR 3398265 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. With a 1/4 inch cutting diameter and a 1-3/4 inch length of cut, this single-end tool handles slotting, profiling, and peripheral milling in a compact form factor. The 4-inch overall length and 1/4 inch shank diameter suit standard collet chucks and end mill holders. A TiAlCN coating extends tool life by reducing heat buildup and improving wear resistance at elevated cutting speeds. The 38-degree helix angle improves chip evacuation and surface finish. This tool is installed and operated by machinists and CNC operators working in job shops, tool rooms, and production environments.

This end mill is suited for milling ferrous and non-ferrous metals, alloys, and hardened materials where a TiAlCN coating provides thermal and oxidation resistance. The variable index design reduces harmonic vibration during cuts, making it appropriate for both conventional and climb milling passes. The right-hand cutting and right-hand flute direction are standard for the majority of CNC machining center spindles. It is a single-end, center-cutting tool capable of plunge entry as well as lateral material removal.

Key Features

• 1/4 inch cutting diameter with 1-3/4 inch length of cut for reach into moderate-depth slots and pockets
• TiAlCN coating for high-temperature wear resistance and extended tool life
• 4-flute spiral geometry for improved surface finish and material removal rate
• 38-degree helix angle promotes efficient chip flow and reduces cutting forces
• Variable index flute spacing minimizes chatter and harmonic vibration
• Center-cutting capable — supports direct plunge entry without pre-drilled pilot holes
• Submicron carbide grade substrate for edge toughness and rigidity

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide end mill compatible with standard 1/4 inch collet chucks, end mill holders, and tool holders used on CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Secure the shank fully within the holder to the minimum insertion depth recommended by the holder manufacturer, and torque the collet nut or set screw per the holder specification. Inspect the cutting edges and coating for damage before each use. Always bring spindle to full programmed speed before engaging the workpiece, and confirm correct cutting direction matches the right-hand spindle rotation.