Accupro 311440 Corner Radius End Mill 1/4 in 5 Flute

Product Description

The ACCUPRO 311440 is a solid carbide corner radius end mill designed for precision milling operations in ferrous and hard materials. It features a 1/4 inch diameter, a 3/4 inch length of cut, and a 2-1/2 inch overall length. The AlCrTiN coating provides heat and wear resistance for extended tool life in demanding cutting conditions. With 5 flutes, a 38-degree helix, and a variable index design, this end mill is engineered for efficient chip evacuation and reduced chatter. It is centercutting-capable, supporting plunge and ramp entry. Machinists and CNC operators working in tool and die, mold making, and precision part production are the primary users of this tool.

This end mill is suited for milling slots, pockets, profiles, and contoured surfaces where a corner radius is required to reduce stress concentration and improve surface finish. The 0.030 inch corner radius makes it appropriate for finishing and semi-finishing passes in hardened steels, stainless steels, and high-temperature alloys. It is a single-end tool with a right-hand cutting direction and right-hand flute spiral. The 1/4 inch shank diameter fits standard collet chucks and end mill holders common in vertical machining centers and CNC mills.

Key Features

• AlCrTiN coating for high-heat and wear resistance in hard material cutting
• 5-flute, 38-degree helix geometry for improved chip flow and surface finish
• Variable index flute spacing reduces harmonic vibration and chatter
• Centercutting design enables plunge and ramp milling operations
• Micrograin solid carbide substrate for rigidity and edge retention
• 0.030 inch corner radius for reduced corner chipping and improved workpiece finish

Compatibility

Designed as a direct-fit replacement for standard 1/4 inch shank end mill holders and collet chucks used in CNC vertical machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before seating the end mill. Confirm collet or holder bore size matches the 1/4 inch shank diameter before tightening. Follow the machine manufacturer's torque specifications for the tool holding system in use.