Accupro 312066 Corner Radius End Mill 3/16 in 5 Flute

Product Description

The ACCUPRO 312066 is a solid carbide corner radius end mill designed for precision milling operations where edge integrity and tool life are critical. Built from micrograin solid carbide and coated with AlCrTiN, this single-end, centercutting tool handles demanding materials and high-speed cutting environments. It features a 3/16-inch mill diameter, a 1/4-inch length of cut, and a 5-flute, right-hand spiral configuration with a variable index for improved chip evacuation and reduced harmonics. The 38-degree helix angle and extended reach design make it suitable for profiling, slotting, and contouring in tight-clearance situations. Machinists and CNC operators in job shops and production environments are the primary installers and users of this tool.

This end mill is suited for ferrous and hardened materials, coatings, and abrasive alloys where AlCrTiN provides thermal and oxidation resistance. The extended reach, with a 1-1/8-inch reach length and a 0.178-inch neck diameter, allows access to deeper features without requiring a long-reach holder. The 0.010-inch corner radius reduces stress concentration at the cutting edge, extending tool life in interrupted cuts and finish passes. A 2-1/2-inch overall length and 3/16-inch shank diameter make this compatible with standard collet chucks and end mill holders in that size range.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance
• AlCrTiN coating for thermal resistance and extended tool life in hard and abrasive materials
• 5-flute variable index design reduces chatter and improves surface finish
• 0.010-inch corner radius protects cutting edge during profiling and finishing passes
• Extended reach with 1-1/8-inch reach length and reduced 0.178-inch neck diameter for deep-feature access
• Centercutting geometry allows plunge entry without pre-drilling

Compatibility

Designed as a direct-fit replacement or standard tooling selection for 3/16-inch collet chucks, shrink-fit holders, and end mill holders used in CNC machining centers and manual mills. No specific OEM model compatibility was stated in the product data.

Installation Notes

Installation is performed by machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and locked before inserting or removing the end mill from the holder. Verify proper tool stick-out to minimize deflection, especially given the extended reach geometry. Consult the machine manufacturer and tooling supplier guidelines for appropriate speeds, feeds, and clamping torque for the holder type in use.