Accupro 311275 Corner Radius End Mill 3/8 in 4-flute Carbide

Product Description

The ACCUPRO 311275 is a solid carbide corner radius end mill designed for high-performance milling in demanding machining applications. Built to Series HS specifications, it features a 3/8 inch diameter, a 7/8 inch length of cut, and a 2-1/2 inch overall length. The AlCrTiN coating provides thermal resistance and extended tool life in abrasive and hard materials. The 0.020 inch corner radius reduces stress concentration at the cutting edge, extending tool life and improving surface finish on workpiece corners. With four flutes, a 38-degree helix, and a variable index design, this end mill is suited for aggressive material removal with reduced chatter. It is centercutting, allowing plunge entry into the workpiece.

The ACCUPRO 311275 is used in CNC machining centers and manual mills for profiling, slotting, and pocketing operations in ferrous and non-ferrous materials. Its micrograin carbide substrate and AlCrTiN coating make it appropriate for hardened steels, stainless, and heat-resistant alloys. The chipbreaker geometry helps manage chip evacuation in deep cuts and high-feed passes. This end mill is a single-end tool with a 3/8 inch shank diameter, making it compatible with standard collet chucks and end mill holders used in production and job shop environments.

Key Features

• AlCrTiN coating for thermal resistance and extended tool life in abrasive and hard materials
• Solid micrograin carbide substrate for rigidity and edge retention
• 0.020 inch corner radius reduces edge chipping and improves corner durability
• Variable index flute spacing reduces harmonic chatter during heavy cuts
• Chipbreaker geometry aids chip evacuation in slotting and deep pocketing
• Centercutting design allows direct plunge entry without a pilot hole

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide corner radius end mill for standard 3/8 inch collet chucks, shrink-fit holders, and end mill holders used in CNC machining center applications.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool from the holder. Use the correct collet size and torque the retention nut to holder manufacturer specifications. Verify runout with a dial indicator after mounting to confirm proper seating before cutting.