Accupro 310521 Corner Radius End Mill 3/4 in 4 Flute

Product Description

The ACCUPRO 310521 is a solid carbide corner radius end mill designed for precision milling operations in ferrous and hardened materials. Built on the HS series platform, this 4-flute, single-end tool features an AlCrTiN coating that improves heat resistance and tool life at elevated cutting speeds. The 3/4 inch diameter matches the straight-cylindrical shank diameter for direct collet or end mill holder mounting. A 38-degree variable-index helix promotes chip evacuation and reduces vibration across the 3.25-inch length of cut. Machinists and tool-and-die shops running CNC vertical machining centers or mills will find this tool suited to deep-cavity and finishing work requiring a controlled corner radius profile.

This end mill is intended for use in milling applications where a precise corner radius is required at the base of a feature or along a profiled wall. The 0.2500 inch corner radius is held to a tolerance of plus or minus 0.00200 inches, making it appropriate for die and mold work, aerospace components, and close-tolerance production runs. The centercutting geometry allows the tool to plunge directly into the workpiece. Right-hand flute direction and right-hand cutting rotation are standard for conventional CNC spindle operation.

Key Features

• AlCrTiN coating provides elevated temperature resistance and extended tool life in ferrous materials
• 4-flute variable-index geometry reduces harmonic vibration during deep cuts
• Centercutting design supports direct plunge entry without pre-drilling
• Micrograin solid carbide construction delivers rigidity across the 3.25-inch length of cut
• 0.2500 inch corner radius held to plus or minus 0.00200 inch tolerance
• Straight-cylindrical 3/4 inch shank compatible with standard ER and end mill holders

Compatibility

Designed as an OEM-style replacement and standard production end mill for CNC machining centers and manual mills accepting a 3/4 inch straight-cylindrical shank. No specific machine model compatibility data was provided by the manufacturer for this SKU.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in an energy-isolated state before mounting or removing the tool. Use a properly sized collet or end mill holder torqued to the machine tool manufacturer's specification. Confirm runout at the cutting diameter before beginning a production run to maintain dimensional accuracy at the corner radius.