Iscar 3398261 Square End Mill 1/4 in 4 Flute Solid Carbide

Product Description

The ISCAR 3398261 is a single-end square end mill designed for precision milling operations in ferrous and non-ferrous materials. Built from submicron-grade solid carbide and coated with TiAlCN, this tool delivers hardness and heat resistance needed for demanding cutting applications. It features a 1/4-inch diameter with a 1-inch length of cut, a 3-inch overall length, and a 38-degree helix angle. The variable index geometry reduces harmonic vibration during high-speed passes, improving surface finish and extending tool life. It is centercutting capable, allowing for direct plunge entry. This tool is installed by machinists and CNC operators in job shop, production, and toolroom environments.

This end mill is suited for slotting, profiling, and peripheral milling in a wide range of workpiece materials. The right-hand cutting and right-hand spiral flute configuration pairs with standard CNC machining centers and manual mills running conventional or climb milling passes. The 1/4-inch shank diameter fits standard collets and end mill holders common in both vertical and horizontal machining setups. Applications include die and mold work, fixture fabrication, and precision part production where tight tolerances and clean square shoulders are required.

Key Features

• Submicron-grade solid carbide construction for rigidity and wear resistance
• TiAlCN coating for elevated heat resistance and reduced built-up edge
• 38-degree helix angle promotes smooth chip evacuation and reduced cutting forces
• Variable index flute spacing minimizes chatter and harmonic vibration
• Centercutting design enables direct plunge milling without a pre-drilled entry
• Right-hand cut with right-hand spiral, 4 flutes for balanced chip load

Compatibility

Designed as an OEM-style solid carbide square end mill replacement for standard 1/4-inch collet chucks and end mill holders used in CNC machining centers and manual milling machines.

Installation Notes

This tool is installed by qualified machinists or CNC operators. Before changing tooling, ensure the spindle is fully stopped and the machine is placed in an appropriate lockout state per facility safety procedures. Use a properly sized collet or end mill holder rated for the 1/4-inch shank diameter and torque the retention nut to the collet manufacturer's specification. Verify runout with a dial indicator after seating to prevent premature tool wear or workpiece damage.