Accupro 311444 Corner Radius End Mill 1/4 in 5 Flute Carbide

Product Description

The ACCUPRO 311444 is a solid carbide corner radius end mill designed for high-performance milling in demanding machining applications. Built to Series HS standards, it features a 1/4 inch cutting diameter, a 3/4 inch length of cut, and a 2.5 inch overall length. The AlCrTiN coating provides excellent heat and wear resistance, making it suitable for hardened steels, stainless, and high-temp alloys. With 5 flutes, a variable index, and a 38-degree helix, this end mill balances chip evacuation and surface finish. It is center cutting, allowing plunge entry, and runs in a right-hand cutting direction with right-hand flute spiral geometry.

This end mill is intended for use in CNC machining centers, vertical mills, and similar equipment where precise profiling, slotting, or contouring is required. The 0.060 inch corner radius reduces stress concentrations at part corners and extends tool life in high-feed applications. It is suited for machinists and tool-and-die professionals working in job shops, production facilities, or tool rooms requiring consistent finish quality on ferrous and non-ferrous materials.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention
• AlCrTiN coating for elevated heat resistance and extended tool life
• 5-flute design with variable index for reduced chatter and improved finish
• Center cutting geometry allows direct plunge entry without pre-drilling
• 0.060 inch corner radius reduces edge chipping and stress at workpiece corners
• 38-degree helix angle promotes efficient chip evacuation in deep cuts

Compatibility

Designed as a direct-fit replacement or standard tooling selection for 1/4 inch collets, ER collet chucks, and end mill holders accepting a 1/4 inch shank diameter in CNC or manual milling setups.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholding procedures. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before seating the shank. Confirm collet or chuck torque specifications per the toolholder manufacturer guidelines. Verify runout with a dial indicator after installation to protect both the tool and workpiece from premature wear or dimensional error.