Accupro 311787 Corner Radius End Mill 3/4 in 5 Flute

Product Description

The ACCUPRO 311787 is a single-end corner radius end mill engineered for high-performance milling in demanding metalworking applications. Built from micrograin solid carbide and coated with AlCrTiN, it delivers heat resistance and wear life in hardened steels, stainless, and high-temp alloys. The 3/4 inch diameter, 5-flute design runs a 38-degree variable-index helix to reduce chatter and improve chip evacuation. With a 0.060 inch corner radius, the tool blends strength at the cutting edge with the ability to produce smooth floor-to-wall transitions. Machinists and CNC programmers in job shops, tool rooms, and production environments rely on this series for finishing and semi-finishing passes where edge life and surface finish both matter.

This end mill fits standard 3/4 inch toolholders including collet chucks, end mill holders, and shrink-fit systems. The 1.625 inch length of cut accommodates moderate-depth slots, pockets, and contour passes without excessive overhang. The 4 inch overall length suits vertical machining centers and horizontal mills running steel, titanium, and other hard materials where a premium carbide substrate and AlCrTiN coating are required. Centercutting geometry allows direct plunge entry where the application permits.

Key Features

• Micrograin solid carbide substrate for rigidity and edge retention in hard materials
• AlCrTiN coating provides thermal protection and oxidation resistance at elevated cutting speeds
• 5-flute variable-index design reduces harmonic vibration and improves surface finish
• 0.060 inch corner radius protects the cutting edge and produces clean radius transitions at pocket floors
• Centercutting capable for direct plunge milling where required
• Right-hand cut and right-hand spiral flute geometry for standard CNC mill spindle use

Compatibility

Designed for use in standard 3/4 inch diameter toolholding systems on CNC vertical and horizontal machining centers running right-hand spindle rotation.

Installation Notes

Installation and tool changes must be performed with the spindle fully stopped and the machine in an e-stop or locked-out state per shop lockout/tagout procedures. Seat the shank fully into the toolholder and torque the retention mechanism to the toolholder manufacturer's specification. Inspect the corner radius and flute edges for chips or coating damage before mounting. Follow the tooling manufacturer's recommended speeds and feeds for the specific workpiece material and do not exceed the rated length of cut during slotting operations.