Accupro 311388 Corner Radius End Mill 3/16 in 5 Flute

Product Description

The ACCUPRO 311388 is a solid carbide corner radius end mill designed for precision milling operations in ferrous and hard materials. Built on the HS Series platform, it features a 3/16 inch (0.1875 inch) diameter with a 5-flute, right-hand spiral configuration and a 38-degree helix angle. The AlCrTiN coating provides thermal resistance and extended tool life in high-speed cutting environments. With centercutting capability and a variable index design, this end mill handles slotting, profiling, and plunge operations. It is installed and operated by machinists and CNC tooling professionals in production and job-shop environments.

This end mill is suited for milling operations requiring a controlled corner radius of 0.0200 inch to reduce stress concentrations and improve surface finish at the base of pocketed features. The 9/16 inch length of cut and 2 inch overall length make it appropriate for shallow-to-moderate depth work in tight-tolerance applications. It is commonly used on CNC machining centers handling die and mold work, aerospace components, and precision mechanical parts where corner geometry must be held consistently.

Key Features

• AlCrTiN coating for high-temperature resistance and extended tool life in hard materials
• 5-flute solid micrograin carbide construction for rigidity and fine surface finish
• 0.0200 inch corner radius reduces stress risers at pocket floors and shoulders
• Variable index flute spacing reduces harmonic chatter during cutting
• Centercutting design allows direct plunge entry without pre-drilling
• Right-hand flute direction and right-hand cutting for standard CNC spindle compatibility

Compatibility

Designed as a single-end corner radius end mill for use in standard 3/16 inch collets, ER-style chucks, or shrink-fit toolholders on CNC milling machines and machining centers.

Installation Notes

This end mill is installed and changed by qualified machinists following shop safety protocols. Ensure the spindle is fully stopped and locked out before changing tooling. Use a properly sized collet or toolholder to achieve correct runout; excessive runout will reduce tool life and compromise corner radius accuracy. Follow machine manufacturer feed and speed recommendations for solid carbide tooling with AlCrTiN coating.