Accupro 312109 Corner Radius End Mill 1/4 in 5 Flute

Product Description

The ACCUPRO 312109 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. With a 1/4 inch diameter and a 0.010 inch corner radius, this single-end, centercutting tool is built for right-hand cutting and right-hand flute direction. The 5-flute configuration with a 38-degree helix and variable index geometry improves chip evacuation and reduces chatter during aggressive cuts. The AlCrTiN coating provides thermal resistance and extends tool life in hard and abrasive workpiece materials. Machinists and CNC operators working in job shop and production environments will find this tool suited for finishing and semi-finishing passes where edge precision matters.

This end mill is built for extended-reach applications, with a 2-1/8 inch reach length and a 4 inch overall length. The 3/8 inch length of cut and 1/4 inch shank diameter make it compatible with standard 1/4 inch collets and tool holders. The reduced neck diameter of 0.237 inches enables deep-pocket access without interference. It is well suited for milling steel, stainless, titanium, and high-temperature alloys where an AlCrTiN coating is the appropriate surface treatment for heat management and wear resistance.

Key Features

• AlCrTiN coating for high-temperature and wear resistance in hard materials
• 5-flute, variable index design reduces vibration and improves surface finish
• Extended reach with 2-1/8 inch reach length for deep-pocket applications
• Solid micrograin carbide substrate for rigidity and edge retention
• Centercutting geometry allows plunge entry into the workpiece
• 0.010 inch corner radius protects the cutting edge and reduces stress concentrations at part corners

Compatibility

Designed as an OEM-style replacement or direct-use tool for machining operations requiring a 1/4 inch shank, extended-reach corner radius end mill in Series HS configuration.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Secure the 1/4 inch shank in a compatible collet or end mill holder and torque the retention system to the tool holder manufacturer's specification. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Verify runout with a dial indicator after seating to confirm proper concentricity before initiating a cut.