Accupro 311831 Corner Radius End Mill 3/4 Inch 5 Flute

Product Description

The ACCUPRO 311831 is a solid carbide corner radius end mill designed for high-performance milling operations in ferrous and hardened materials. Built to Series HS specifications, this single-end tool features a 3/4 inch diameter, a 0.25 inch corner radius, and a 38-degree helix angle with variable index geometry. The five-flute configuration combined with an AlCrTiN coating supports elevated cutting speeds and extended tool life under demanding conditions. It is centercutting, which allows plunge entry without a pre-drilled pilot hole. Licensed machinists and CNC programmers specify this tool for finishing and semi-finishing passes where edge integrity and surface finish are critical.

This end mill is suited for mold and die work, aerospace component machining, and general precision metal removal where corner blending or radius profiling is required. The 2.75 inch length of cut accommodates deeper cavity work, while the 5 inch overall length provides clearance in setups with moderate workpiece height. The right-hand flute direction and right-hand cutting orientation are standard for conventional vertical and horizontal machining centers. The micrograin carbide substrate supports rigidity and heat resistance at aggressive feed rates.

Key Features

• AlCrTiN coating for heat resistance and extended tool life in hardened steels
• Solid micrograin carbide substrate for rigidity and wear resistance
• Variable index flute spacing reduces harmonic chatter during heavy cuts
• 0.25 inch corner radius blends edges and reduces stress concentration at corners
• Centercutting design enables direct plunge entry
• Five flutes with right-hand spiral for efficient chip evacuation

Compatibility

Designed as a standard shank replacement end mill for 3/4 inch collet or end mill holders on vertical machining centers and CNC mills requiring a corner radius end profile.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Power down and lock out the spindle before mounting or removing the tool. Use a calibrated torque wrench and the appropriate collet or end mill holder to secure the 3/4 inch shank without over-tightening. Inspect the cutting edges and coating for chips or wear before each use, and verify runout with a dial indicator after seating.