Accupro 311477 Square End Mill 5/16 in 5 Flute Solid Carbide

Product Description

The ACCUPRO 311477 is a solid carbide square end mill engineered for high-performance milling in ferrous and non-ferrous materials. Measuring 5/16 inches in diameter with a 7/16-inch length of cut and a 2-inch overall length, this single-end tool features five flutes with a 38-degree helix angle and a variable index design that helps reduce chatter and improve surface finish. The AlTiCrN coating provides excellent heat resistance and wear protection during aggressive cutting operations. Machinists and toolroom professionals working on CNC machining centers or manual mills will find this tool well-suited for finishing and semi-finishing passes requiring tight tolerances.

This end mill is designed for use in general-purpose and precision milling applications across job shops, production machining, and tool-and-die environments. The 5/16-inch shank diameter matches the cutting diameter, making it compatible with standard collet chucks and end mill holders in that size. Right-hand flute direction and right-hand cutting orientation are standard for conventional CNC setups. The HS series designation places it in a category optimized for higher-speed, shorter-reach applications where rigidity and cutting-edge integrity are priorities.

Key Features

• 5-flute geometry increases feed rates compared to standard 4-flute designs in finishing applications
• 38-degree helix angle promotes smooth chip evacuation and reduces cutting forces
• Variable index spacing minimizes harmonic vibration and chatter
• AlTiCrN coating delivers thermal and wear resistance for extended tool life
• Micrograin solid carbide substrate provides rigidity and edge retention
• Center-cutting capable, allowing plunge entry without a pre-drilled hole

Compatibility

Designed as an OEM-style solid carbide square end mill for use with standard 5/16-inch collet chucks and end mill holders on CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is powered down before mounting or changing end mills. Use a properly sized collet or tool holder torqued to the machine manufacturer's specification to prevent tool pullout. Verify runout with a dial indicator after installation before beginning cuts.