Accupro 12183031 Corner Radius End Mill 5/16 in 4 Flute

Product Description

The ACCUPRO 12183031 is a solid carbide corner radius end mill designed for precision milling operations requiring a controlled edge radius and extended tool life. It features a 5/16 inch diameter with a 0.01 inch corner radius that reduces edge chipping and stress concentrations at the corner. The 4-flute, right-hand spiral geometry with a 40-degree helix angle promotes efficient chip evacuation and stable cutting at higher feed rates. A TiCN coating improves surface hardness and wear resistance, making this end mill well suited for machining hardened steels, stainless steels, and other demanding materials. Machinists and tool-and-die professionals are the primary users of this type of cutter.

This end mill is appropriate for milling slots, pockets, contours, and profiling operations in ferrous and non-ferrous materials where a small corner radius is specified on the finished part. The long-length designation, with a 1-1/8 inch length of cut and 3 inch overall length on a 5/16 inch shank, provides additional reach for deeper cavities while maintaining rigidity. Its centercutting capability allows it to plunge directly into workpiece material, adding flexibility in multi-operation setups on CNC machining centers and manual knee mills.

Key Features

• 0.01 inch corner radius reduces stress concentration and edge breakout on finished corners
• TiCN coating increases surface hardness and extends tool life in abrasive and hardened materials
• 4-flute spiral design with 40-degree helix angle for efficient chip evacuation and smooth finishes
• Centercutting geometry allows direct plunge entry without a pre-drilled hole
• Micrograin solid carbide substrate provides rigidity and resistance to deflection
• Long-length configuration with 1-1/8 inch LOC for deeper pocket and cavity work

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and manual mills accepting a 5/16 inch straight shank end mill holder or collet chuck.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before seating the shank. Use an appropriate collet or end mill holder sized for a 5/16 inch shank and torque the retention hardware per the tool holder manufacturer specifications. Verify runout with a dial indicator after mounting to minimize premature wear and maintain tolerance.