Accupro 311190 Ball End Mill 5/16 in 4 Flute Solid Carbide

Product Description

The ACCUPRO 311190 is a solid carbide ball end mill designed for precision milling operations in metalworking and machining applications. It carries a 5/16 inch (0.3125 inch) mill diameter with a 7/16 inch length of cut and a 2 inch overall length. The four-flute geometry with a 38-degree helix angle promotes efficient chip evacuation and smooth surface finishes in ferrous and hardened materials. An AlTiCrN coating provides thermal resistance and extended tool life in high-speed and dry cutting conditions. The variable index design reduces harmonic vibration during aggressive cuts. This tool is installed by machinists and CNC operators working in job shop, production, and tool-and-die environments.

The ACCUPRO 311190 suits a wide range of milling applications including profile milling, slotting, and 3D contouring on machining centers and CNC mills. The micrograin carbide substrate and AlTiCrN coating make it well suited for cutting alloy steels, stainless steels, cast iron, and hardened workpiece materials. The straight-cylindrical shank fits standard end mill holders, collet chucks, and shrink-fit tooling. Standard-length geometry fits most spindle configurations without extended reach requirements.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance
• AlTiCrN coating for high-temperature performance and extended tool life
• 38-degree right-hand helix for efficient chip evacuation
• 4-flute, variable index design reduces chatter and harmonic vibration
• Single-end ball profile for 3D contouring and radius milling
• Straight-cylindrical shank compatible with standard collet and end mill holders

Compatibility

Designed as an OEM-style replacement and standard-production ball end mill suitable for use in CNC machining centers and manual knee mills accepting a 5/16 inch straight-cylindrical shank.

Installation Notes

Installation should be performed by qualified machinists following shop safety procedures. Secure the shank fully within the holder to the recommended gauge-line depth before torquing the retention mechanism. Verify runout with a dial indicator before beginning a cut. Follow machine manufacturer guidelines and applicable OSHA standards for spindle speeds, feed rates, and personal protective equipment when operating cutting tools.