Accupro 12179634 Corner Radius End Mill 5/16 in 3 Flute Carbide

Product Description

The ACCUPRO 12179634 is a solid carbide corner radius end mill designed for precision milling in metal and composite materials. It features a 5/16-inch cutting diameter and a 0.045-inch corner radius that blends the side wall and floor of a pocket or slot, reducing stress concentrations and extending tool life. With 3 flutes and a 30-degree helix angle, it delivers efficient chip evacuation and a smooth surface finish. A ZrN (zirconium nitride) coating adds hardness and heat resistance, making it suitable for higher-speed dry or near-dry cutting applications. Licensed machinists and CNC operators install this tool type on vertical machining centers and manual mills.

This end mill is suited for light to medium roughing and finishing passes in ferrous and non-ferrous materials. The stub-length configuration keeps overhang short, improving rigidity and reducing chatter during tight-tolerance work. Its centercutting geometry allows plunge milling into a workpiece without a pre-drilled entry hole. Typical applications include mold and die work, fixture machining, and general-purpose CNC production where a radiused corner profile is required to meet part drawings or reduce corner cracking in hardened materials.

Key Features

• 0.045-inch corner radius blends wall-to-floor transitions for reduced stress and improved part finish
• Solid carbide construction provides rigidity and wear resistance over high-speed steel alternatives
• ZrN coating increases surface hardness and thermal resistance for higher cutting speeds
• 3-flute, right-hand cut and right-hand flute geometry with 30-degree helix for efficient chip evacuation
• Centercutting design supports direct plunge entry without a pilot hole
• Stub length (1/2-inch LOC) minimizes deflection in tight setups

Compatibility

Designed as a standard-shank replacement end mill for CNC machining centers and manual mills accepting a 5/16-inch collet or end mill holder.

Installation Notes

Installation is performed by a machinist or CNC operator. Power down and lock out the spindle before loading or removing the tool from the holder. Seat the shank fully into the collet or set-screw holder and torque the retention hardware to the tool holder manufacturer's specification. Verify runout with a dial indicator before beginning the cut, as excessive runout accelerates corner-radius wear and reduces dimensional accuracy.