Accupro 12182841 Corner Radius End Mill 5/16 in 4 Flute

Product Description

The ACCUPRO 12182841 is a single-end corner radius end mill designed for precision milling in ferrous and non-ferrous metals. Ground from micrograin solid carbide, it delivers superior edge retention and dimensional stability compared to high-speed steel tooling. The cutting diameter measures 5/16 inches (0.3125 inches), with a corner radius of 0.015 inches that protects part edges and reduces stress concentrations at slot and pocket corners. A TiCN coating lowers friction, improves surface finish, and extends tool life in harder materials. Four right-hand spiral flutes with a 40-degree helix angle provide efficient chip evacuation and smooth cutting action. This tool is centercutting, allowing direct plunge entry into workpieces.

This end mill is suited for die and mold work, fixture machining, and general CNC milling operations where a radiused corner is required on slots, pockets, or profiled surfaces. The stub length configuration keeps overhang minimal, improving rigidity and reducing chatter on vertical machining centers and manual knee mills. The 5/16-inch shank diameter fits standard collet chucks and end mill holders. It is installed and operated by machinists, toolmakers, and CNC programmers working in job shops, production facilities, and maintenance machining environments.

Key Features

• 0.015-inch corner radius reduces stress risers and protects part geometry at pocket and slot edges
• Micrograin solid carbide substrate provides high hardness and wear resistance
• TiCN coating reduces friction and extends tool life in ferrous materials
• 4 right-hand spiral flutes at 40-degree helix angle for efficient chip evacuation
• Centercutting design allows direct plunge milling without a pre-drilled hole
• Stub length reduces overhang and improves tool rigidity during cuts

Compatibility

Designed as a direct-fit replacement or standard tooling selection for any CNC or manual milling machine equipped with a 5/16-inch collet, end mill holder, or equivalent toolholding system.

Installation Notes

Install this end mill in a clean, properly sized collet or end mill holder and torque the retention system according to the toolholder manufacturer specifications. Confirm runout with a dial indicator before production cutting. Always follow machine lockout and spindle-stop procedures before changing tooling. Use cutting fluid or air blast appropriate for the workpiece material to maintain coating integrity and chip clearance.