Accupro 311489 Corner Radius End Mill 5/16 in 5 Flute

Product Description

The ACCUPRO 311489 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. With a 5/16-inch diameter and a 7/16-inch length of cut, this single-end mill delivers controlled material removal with a 0.060-inch corner radius that reduces stress concentrations at the cutting edge. The 5-flute, right-hand spiral geometry combined with a 38-degree helix angle promotes smooth chip evacuation and improves surface finish. An AlCrTiN coating provides thermal resistance and extended tool life in high-temperature cutting conditions. This tool is center-cutting, allowing for direct plunge entry. Machinists and CNC operators working in job shops, tool rooms, and production environments install this type of end mill in standard milling machines and machining centers.

The 311489 is suited for finish milling, contouring, and profiling operations where edge integrity and dimensional accuracy matter. The variable index flute spacing helps suppress chatter during aggressive passes. With a 2-inch overall length and a 5/16-inch shank diameter, it mounts directly into standard collet chucks or end mill holders. The micrograin solid carbide construction supports use in ferrous and non-ferrous materials where hardness and wear resistance are priorities. This end mill is appropriate for both roughing and finishing passes depending on feed and speed parameters selected by the operator.

Key Features

• 5-flute, right-hand spiral design with 38-degree helix for efficient chip evacuation
• AlCrTiN coating for high thermal resistance and extended tool life
• 0.060-inch corner radius reduces edge chipping and stress at the cutting corner
• Center-cutting geometry allows direct plunge milling
• Variable index flute spacing reduces harmonic chatter
• Micrograin solid carbide construction for rigidity and wear resistance

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide corner radius end mill for standard 5/16-inch collet chucks, shrink-fit holders, and end mill holders used in CNC and manual milling applications.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and locked out before inserting or removing the tool from the holder. Use a properly sized collet or holder matched to the 5/16-inch shank diameter to ensure concentricity and prevent pullout. Verify runout with a dial indicator after installation before beginning any cutting operation.