Iscar 3398291 Square End Mill 7/16 in 4 Flute Carbide

Product Description

The ISCAR 3398291 is a solid carbide square end mill designed for precision milling operations in metalworking and machining environments. It measures 7/16 inches (0.4375 inches) in cutting diameter with a 5/8-inch length of cut and a 2-3/4-inch overall length. The four-flute, single-end configuration paired with a 38-degree helix angle supports efficient chip evacuation and smooth cutting action. A TiAlCN coating adds heat resistance and wear life, making this end mill suited for harder workpiece materials. The submicron carbide grade provides a fine grain structure for edge stability under demanding cutting conditions. This tool is intended for use by machinists and CNC operators in job shop and production environments.

This end mill is used in milling centers and manual knee mills for slotting, profiling, and peripheral milling operations. The variable index flute spacing helps reduce chatter at higher feed rates. The right-hand cut and right-hand spiral flute direction are standard for conventional and climb milling on CNC machining centers. It is applicable to ferrous and non-ferrous materials where a TiAlCN coating provides thermal and oxidation resistance at the cutting edge.

Key Features

• 7/16-inch (0.4375 inches) cutting diameter with matching 7/16-inch shank diameter for direct collet or end mill holder fitment
• 4-flute spiral geometry with 38-degree helix angle for balanced chip flow and surface finish
• TiAlCN coating for elevated heat resistance and extended tool life in demanding materials
• Submicron solid carbide grade for fine grain edge retention and dimensional stability
• Variable index flute spacing reduces harmonic vibration and chatter during cuts
• Center-cutting design allows direct plunge entry into the workpiece

Compatibility

Designed as a direct-fit replacement end mill for standard 7/16-inch collets, end mill holders, and shrink-fit tooling systems used in CNC and manual milling machines.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully into the collet or holder and torque the retention mechanism to the toolholder specification. Verify runout with a dial indicator before initiating a cut to protect both the tool and the workpiece.