Accupro 312103 Corner Radius End Mill 1/4 in 5 Flute Carbide

Product Description

The ACCUPRO 312103 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. It features a 1/4 inch diameter with a matching 1/4 inch shank, a 3/8 inch length of cut, and a 4 inch overall length. The AlCrTiN coating provides high heat and wear resistance, making it well suited for hard materials and high-speed cutting applications. With a 5-flute design, variable index, right-hand cutting and flute direction, and a 0.060 inch corner radius, this tool delivers smooth finishes and extended tool life in both roughing and finishing passes. It is centercutting and capable of plunge milling.

This end mill is built for machinists and CNC operators working in job shops, tool rooms, and production environments. The extended reach configuration, with a 1-1/8 inch reach length and a 0.237 inch neck diameter, allows access to deeper features and pockets without sacrificing rigidity. It is a single-end tool suited for ferrous and non-ferrous materials where corner radius geometry is required to reduce stress concentration at the base of milled features. The 38-degree helix angle promotes efficient chip evacuation during high-feed operations.

Key Features

• AlCrTiN coating for high-temperature wear resistance in hard material applications
• 5-flute spiral geometry with variable index for reduced harmonic chatter
• Extended reach design with 1-1/8 inch reach length and 0.237 inch neck diameter
• 0.060 inch corner radius reduces stress risers and improves surface finish at pocket floors
• Centercutting capability allows direct plunge entry without pre-drilling
• Micrograin solid carbide substrate for dimensional stability and edge retention

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and manual mills accepting 1/4 inch straight shank end mills with ER or similar collet-style toolholding systems.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully powered down and locked out per applicable shop safety procedures. Use a properly sized collet or toolholder rated for 1/4 inch shank tooling and torque the collet nut to the toolholder manufacturer specification. Inspect the shank and collet bore for chips or contamination before seating the tool. Verify runout with a dial indicator before commencing cuts, particularly given the extended reach geometry.