Accupro 12183266 Corner Radius End Mill 5/16in 4 Flute Ticn

Product Description

The ACCUPRO 12183266 is a solid carbide corner radius end mill designed for high-performance milling in ferrous and non-ferrous materials. It features a 5/16-inch diameter, a 0.09-inch corner radius, and four right-hand spiral flutes with a 40-degree helix angle for aggressive chip evacuation and smooth surface finishes. The TiCN (titanium carbonitride) coating increases surface hardness and reduces friction, extending tool life in demanding cutting environments. This is a single-end, centercutting tool, meaning it can plunge directly into workpiece material. It is suited for CNC machining centers and manual mills operated by machinists and tooling professionals.

This end mill is built for applications requiring extra-long reach into deep pockets, slots, and contoured profiles where a standard-length tool cannot reach. The 1-5/8-inch length of cut and 4-inch overall length provide clearance in deep-cavity work. The corner radius geometry reduces stress concentrations at the cutting edge, making it a common choice for die and mold work, aerospace components, and precision part finishing. Right-hand cutting direction suits conventional CNC setups running standard spindle rotation.

Key Features

• 5/16-inch mill diameter with 0.09-inch corner radius for blended edge geometry
• TiCN coating for increased hardness and extended tool life in abrasive materials
• 4-flute, 40-degree helix spiral design promotes efficient chip evacuation
• Centercutting capability allows direct plunge entry into workpiece
• Extra-long length type with 4-inch OAL and 1-5/8-inch LOC for deep-reach applications
• Micrograin solid carbide substrate for rigidity and wear resistance

Compatibility

Designed as a replacement or direct-use solid carbide corner radius end mill for CNC machining centers and manual mills accepting a 5/16-inch straight shank. Shank diameter tolerance is -0.0001 to -0.0004 inches for secure collet or end mill holder retention.

Installation Notes

Installation should be performed by a qualified machinist familiar with toolholder torque requirements and runout specifications. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into a clean, undamaged collet or end mill holder and verify runout with a dial indicator before beginning a cut. Follow the machine manufacturer and tooling manufacturer guidelines for recommended speeds and feeds based on workpiece material.