Accupro 311408 Corner Radius End Mill 1/4 in 5 Flute Carbide

Product Description

The ACCUPRO 311408 is a solid carbide corner radius end mill designed for high-performance milling in demanding shop environments. It features a 1/4 inch diameter, a 3/8 inch length of cut, and a 2 inch overall length. The 5-flute geometry with a 38-degree helix angle promotes smooth chip evacuation and improved surface finishes at higher feed rates. An AlCrTiN coating delivers elevated heat and wear resistance, extending tool life in abrasive and hard materials. The corner radius end type reduces stress concentration at the cutting edge, making it well suited for profiling and finishing passes where edge chipping is a concern.

This end mill is intended for use in CNC machining centers and manual mills where precision profiling, slotting, and contouring operations are performed. The centercutting design allows plunge entry directly into the workpiece. The 1/4 inch shank fits standard ER collets and end mill holders common in job shops, tool rooms, and production environments. It is a single-end tool in the HS Series, ground from micrograin solid carbide stock for dimensional consistency across the cutting edge.

Key Features

• 5-flute design with 38-degree helix angle for improved feed rates and surface finish
• AlCrTiN coating for high-temperature and wear resistance in abrasive materials
• Corner radius end type reduces edge stress and extends tool life in profiling operations
• Centercutting geometry allows direct plunge milling without pre-drilling
• Variable index flute spacing reduces harmonic chatter during cutting
• Micrograin solid carbide construction for consistent edge sharpness and rigidity

Compatibility

Designed as a direct-fit replacement for standard 1/4 inch shank end mill holders and ER collet systems. Verify holder runout and collet condition before installation to maintain diameter tolerance of +0.000000 / -0.001000 inches.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the spindle drive before loading or changing tooling. Seat the shank fully into the collet or holder to the recommended gauge line and torque the retention nut per the toolholder manufacturer specification. Inspect the cutting edge under magnification before use and discard any tool showing chipping or coating delamination.