Accupro 12183001 Corner Radius End Mill 1/4 in 4 Flute

Product Description

The ACCUPRO 12183001 is a solid carbide corner radius end mill designed for precision milling operations requiring a controlled edge radius. The tool measures 0.25 inches in diameter with a 0.03 inch corner radius and a 1.125 inch length of cut, providing long-reach capability for deeper cavity and slot work. It carries a 40-degree helix angle with four right-hand spiral flutes and a bright, uncoated finish. The centercutting geometry allows direct plunge entry without a pre-drilled hole. Overall length is 3 inches. Micrograin carbide construction supports higher feed rates and extended tool life in ferrous and non-ferrous applications. This tool is installed by machinists and CNC operators in job shop and production environments.

The 12183001 is suited for finishing passes, contour milling, and 3D profiling where a small corner radius is needed to reduce stress concentrations and improve surface finish at part edges. Its long-flute, long-reach configuration makes it appropriate for deep pockets, mold cavities, and multi-pass finishing operations on machining centers and CNC mills. The 1/4 inch shank diameter fits standard ER collet chucks and end mill holders commonly found on vertical and horizontal machining centers.

Key Features

• 0.03 inch corner radius reduces edge chipping and stress concentration at workpiece corners
• 40-degree helix angle promotes smooth chip evacuation and lower cutting forces
• Four right-hand spiral flutes for balanced cutting action and improved surface finish
• Centercutting design allows direct plunge milling without pilot drilling
• Micrograin solid carbide substrate supports rigidity and wear resistance
• Bright, uncoated finish suitable for aluminum, non-ferrous metals, and dry cutting applications

Compatibility

Designed as an OEM-style replacement and standard tooling option for 1/4 inch ER collet chucks, end mill holders, and compatible CNC milling machine spindles accepting 1/4 inch shank tooling.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully powered down and locked out before mounting or removing the tool. Seat the shank fully into the collet or holder and torque the retention nut per the toolholder manufacturer specifications. Verify runout with a dial indicator before beginning a cut, as excessive runout will accelerate flute wear and degrade corner radius tolerance.