Accupro 311509 Corner Radius End Mill 5/16 in Solid Carbide

Product Description

The ACCUPRO 311509 is a solid carbide corner radius end mill designed for precision milling in demanding metalworking applications. It features a 5/16 inch diameter with a 1 inch length of cut and a 3 inch overall length. The five-flute geometry with a 38-degree helix angle promotes efficient chip evacuation and smooth cutting action. An AlCrTiN coating provides high heat resistance and extended tool life in hard and abrasive materials. The variable index design reduces harmonic vibration, improving surface finish quality. Center cutting capability allows direct plunging into the workpiece. This tool is intended for use by machinists and CNC operators in production and job shop environments.

The 311509 is suited for side milling, slotting, and profile milling operations where a radiused corner is required to reduce stress concentrations at part corners. The micrograin solid carbide substrate supports high-speed machining in steels, stainless steels, cast irons, and similar ferrous materials. The single-end configuration and right-hand cut with right-hand flute direction make it a direct fit for standard CNC machining center and manual mill setups. Applications span aerospace, automotive, die and mold, and general precision component manufacturing.

Key Features

• 5-flute design increases chip load capacity and improves surface finish over standard 4-flute tools
• AlCrTiN coating delivers superior oxidation resistance and hardness at elevated cutting temperatures
• 38-degree helix angle promotes aggressive chip evacuation and reduces cutting forces
• Variable index geometry dampens vibration and chatter during high-speed cuts
• Center cutting construction allows direct plunge entry without pre-drilling
• Micrograin solid carbide substrate provides rigidity and wear resistance in ferrous materials

Compatibility

Designed as an OEM-style replacement or direct-use corner radius end mill compatible with standard 5/16 inch collet or end mill holder tooling systems on CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before changing tooling. Use a properly sized collet or end mill holder and torque to the tool holder specification per the manufacturer guidelines. Verify runout with a dial indicator before beginning production cuts to confirm seating and minimize tool deflection.